3665229520 has 20 divisors (see below), whose sum is σ = 8521658820. Its totient is φ = 1466091776.

The previous prime is 3665229517. The next prime is 3665229551. The reversal of 3665229520 is 259225663.

It can be written as a sum of positive squares in 2 ways, for example, as 661312656 + 3003916864 = 25716^2 + 54808^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22907605 + ... + 22907764.

It is an arithmetic number, because the mean of its divisors is an integer number (426082941).

Almost surely, 2^3665229520 is an apocalyptic number.

It is an amenable number.

3665229520 is an abundant number, since it is smaller than the sum of its proper divisors (4856429300).

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

3665229520 is a wasteful number, since it uses less digits than its factorization.

3665229520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45815382 (or 45815376 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 3665229520 is about 60541.1390708830. The cubic root of 3665229520 is about 1541.8201787367.

The spelling of 3665229520 in words is "three billion, six hundred sixty-five million, two hundred twenty-nine thousand, five hundred twenty".