3661664255525 has 24 divisors (see below), whose sum is σ = 4554615340128. Its totient is φ = 2920203000000.

The previous prime is 3661664255519. The next prime is 3661664255533. The reversal of 3661664255525 is 5255524661663.

It is not a de Polignac number, because 3661664255525 - 2⁸ = 3661664255269 is a prime.

It is a Duffinian number.

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, 161359430 + ... + 161382120.

It is an arithmetic number, because the mean of its divisors is an integer number (189775639172).

Almost surely, 2^{3661664255525} is an apocalyptic number.

It is an amenable number.

3661664255525 is a deficient number, since it is larger than the sum of its proper divisors (892951084603).

3661664255525 is a wasteful number, since it uses less digits than its factorization.

3661664255525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42533 (or 42528 counting only the distinct ones).

The product of its digits is 38880000, while the sum is 56.

The spelling of 3661664255525 in words is "three trillion, six hundred sixty-one billion, six hundred sixty-four million, two hundred fifty-five thousand, five hundred twenty-five".