66777772104 has 24 divisors (see below), whose sum is σ = 180856466310. Its totient is φ = 22259257344.

The previous prime is 66777772079. The next prime is 66777772129. The reversal of 66777772104 is 40127777766.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66777772079) and next prime (66777772129).

It can be written as a sum of positive squares in only one way, i.e., 46871384004 + 19906388100 = 216498^2 + 141090^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 463734457 + ... + 463734600.

Almost surely, 2^66777772104 is an apocalyptic number.

It is an amenable number.

66777772104 is an abundant number, since it is smaller than the sum of its proper divisors (114078694206).

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

66777772104 is a wasteful number, since it uses less digits than its factorization.

66777772104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927469069 (or 927469062 counting only the distinct ones).

The product of its (nonzero) digits is 4840416, while the sum is 54.

The spelling of 66777772104 in words is "sixty-six billion, seven hundred seventy-seven million, seven hundred seventy-two thousand, one hundred four".