66515500560 has 80 divisors (see below), whose sum is σ = 206742392640. Its totient is φ = 17690641920.

The previous prime is 66515500553. The next prime is 66515500607. The reversal of 66515500560 is 6500551566.

It is a tau number, because it is divible by the number of its divisors (80).

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, 274671 + ... + 456590.

It is an arithmetic number, because the mean of its divisors is an integer number (2584279908).

Almost surely, 2^66515500560 is an apocalyptic number.

66515500560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66515500560 is an abundant number, since it is smaller than the sum of its proper divisors (140226892080).

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

66515500560 is a wasteful number, since it uses less digits than its factorization.

66515500560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731656 (or 731650 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 39.

The spelling of 66515500560 in words is "sixty-six billion, five hundred fifteen million, five hundred thousand, five hundred sixty".