66776568870 has 48 divisors (see below), whose sum is σ = 176157702000. Its totient is φ = 16188258240.

The previous prime is 66776568853. The next prime is 66776568913. The reversal of 66776568870 is 7886567766.

It is a super-2 number, since 2×66776568870² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9194245 + ... + 9201504.

It is an arithmetic number, because the mean of its divisors is an integer number (3669952125).

Almost surely, 2^66776568870 is an apocalyptic number.

66776568870 is an abundant number, since it is smaller than the sum of its proper divisors (109381133130).

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

66776568870 is a wasteful number, since it uses less digits than its factorization.

66776568870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18395781 (or 18395770 counting only the distinct ones).

The product of its (nonzero) digits is 142248960, while the sum is 66.

The spelling of 66776568870 in words is "sixty-six billion, seven hundred seventy-six million, five hundred sixty-eight thousand, eight hundred seventy".