3665243646 has 48 divisors (see below), whose sum is σ = 8296404480. Its totient is φ = 1168076880.

The previous prime is 3665243633. The next prime is 3665243651. The reversal of 3665243646 is 6463425663.

3665243646 is a `hidden beast` number, since 3 + 66 + 524 + 3 + 64 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6745 + ... + 85883.

It is an arithmetic number, because the mean of its divisors is an integer number (172841760).

Almost surely, 2^3665243646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3665243646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4148202240).

3665243646 is an abundant number, since it is smaller than the sum of its proper divisors (4631160834).

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

3665243646 is a wasteful number, since it uses less digits than its factorization.

3665243646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79261 (or 79258 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 45.

The square root of 3665243646 is about 60541.2557352422. The cubic root of 3665243646 is about 1541.8221594879.

The spelling of 3665243646 in words is "three billion, six hundred sixty-five million, two hundred forty-three thousand, six hundred forty-six".