66877760810 has 32 divisors (see below), whose sum is σ = 145669881600. Its totient is φ = 21580722432.

The previous prime is 66877760773. The next prime is 66877760863. The reversal of 66877760810 is 1806777866.

66877760810 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66877760810² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

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, 28098710 + ... + 28101089.

It is an arithmetic number, because the mean of its divisors is an integer number (4552183800).

Almost surely, 2^66877760810 is an apocalyptic number.

66877760810 is an abundant number, since it is smaller than the sum of its proper divisors (78792120790).

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

66877760810 is a wasteful number, since it uses less digits than its factorization.

66877760810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56199830.

The product of its (nonzero) digits is 4741632, while the sum is 56.

The spelling of 66877760810 in words is "sixty-six billion, eight hundred seventy-seven million, seven hundred sixty thousand, eight hundred ten".