6615520660 has 48 divisors (see below), whose sum is σ = 15917376384. Its totient is φ = 2262446208.

The previous prime is 6615520633. The next prime is 6615520679. The reversal of 6615520660 is 660255166.

It is a super-2 number, since 2×6615520660² = 87530227205773671200, which contains 22 as substring.

It is a congruent number.

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, 3934 + ... + 115093.

It is an arithmetic number, because the mean of its divisors is an integer number (331612008).

Almost surely, 2^6615520660 is an apocalyptic number.

It is an amenable number.

6615520660 is an abundant number, since it is smaller than the sum of its proper divisors (9301855724).

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

6615520660 is a wasteful number, since it uses less digits than its factorization.

6615520660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119440 (or 119438 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 6615520660 is about 81335.8510129451. The cubic root of 6615520660 is about 1877.2466731847.

The spelling of 6615520660 in words is "six billion, six hundred fifteen million, five hundred twenty thousand, six hundred sixty".