3661664255520 has 96 divisors (see below), whose sum is σ = 11537633011968. Its totient is φ = 976156766208.

The previous prime is 3661664255519. The next prime is 3661664255533. The reversal of 3661664255520 is 255524661663.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515832 + ... + 2754888.

It is an arithmetic number, because the mean of its divisors is an integer number (120183677208).

Almost surely, 2^{3661664255520} is an apocalyptic number.

3661664255520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3661664255520 is an abundant number, since it is smaller than the sum of its proper divisors (7875968756448).

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

3661664255520 is a wasteful number, since it uses less digits than its factorization.

3661664255520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242482 (or 2242474 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 51.

The spelling of 3661664255520 in words is "three trillion, six hundred sixty-one billion, six hundred sixty-four million, two hundred fifty-five thousand, five hundred twenty".