66549711580 has 24 divisors (see below), whose sum is σ = 152459339760. Its totient is φ = 24199895040.

The previous prime is 66549711563. The next prime is 66549711607. The reversal of 66549711580 is 8511794566.

It is a super-2 number, since 2×66549711580² (a number of 22 digits) 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 7 ways as a sum of consecutive naturals, for example, 151249125 + ... + 151249564.

It is an arithmetic number, because the mean of its divisors is an integer number (6352472490).

Almost surely, 2^66549711580 is an apocalyptic number.

It is an amenable number.

66549711580 is an abundant number, since it is smaller than the sum of its proper divisors (85909628180).

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

66549711580 is a wasteful number, since it uses less digits than its factorization.

66549711580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302498709 (or 302498707 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 66549711580 in words is "sixty-six billion, five hundred forty-nine million, seven hundred eleven thousand, five hundred eighty".