66655677627880 has 64 divisors (see below), whose sum is σ = 163611477763200. Its totient is φ = 24238119010560.

The previous prime is 66655677627871. The next prime is 66655677627901. The reversal of 66655677627880 is 8872677655666.

It is a self number, because there is not a number n which added to its sum of digits gives 66655677627880.

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, 35089941 + ... + 36940699.

It is an arithmetic number, because the mean of its divisors is an integer number (2556429340050).

Almost surely, 2^{66655677627880} is an apocalyptic number.

It is an amenable number.

66655677627880 is an abundant number, since it is smaller than the sum of its proper divisors (96955800135320).

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

66655677627880 is a wasteful number, since it uses less digits than its factorization.

66655677627880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932634 (or 1932630 counting only the distinct ones).

The product of its (nonzero) digits is 8534937600, while the sum is 79.

The spelling of 66655677627880 in words is "sixty-six trillion, six hundred fifty-five billion, six hundred seventy-seven million, six hundred twenty-seven thousand, eight hundred eighty".