66877887128 has 32 divisors (see below), whose sum is σ = 135066204000. Its totient is φ = 30861159168.

The previous prime is 66877887119. The next prime is 66877887173. The reversal of 66877887128 is 82178877866.

66877887128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 553325 + ... + 663267.

It is an arithmetic number, because the mean of its divisors is an integer number (4220818875).

Almost surely, 2^66877887128 is an apocalyptic number.

It is an amenable number.

66877887128 is an abundant number, since it is smaller than the sum of its proper divisors (68188316872).

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

66877887128 is a wasteful number, since it uses less digits than its factorization.

66877887128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115811 (or 115807 counting only the distinct ones).

The product of its digits is 101154816, while the sum is 68.

The spelling of 66877887128 in words is "sixty-six billion, eight hundred seventy-seven million, eight hundred eighty-seven thousand, one hundred twenty-eight".