3665243520 has 320 divisors, whose sum is σ = 13862534400. Its totient is φ = 919683072.

The previous prime is 3665243513. The next prime is 3665243521. The reversal of 3665243520 is 253425663.

3665243520 is a `hidden beast` number, since 36 + 65 + 2 + 43 + 520 = 666.

3665243520 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665243521) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 879201 + ... + 883359.

It is an arithmetic number, because the mean of its divisors is an integer number (43320420).

Almost surely, 2^3665243520 is an apocalyptic number.

3665243520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3665243520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6931267200).

3665243520 is an abundant number, since it is smaller than the sum of its proper divisors (10197290880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3665243520 is a wasteful number, since it uses less digits than its factorization.

3665243520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4207 (or 4186 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The square root of 3665243520 is about 60541.2546946295. The cubic root of 3665243520 is about 1541.8221418202.

The spelling of 3665243520 in words is "three billion, six hundred sixty-five million, two hundred forty-three thousand, five hundred twenty".