66779321208 has 16 divisors (see below), whose sum is σ = 166948303080. Its totient is φ = 22259773728.

The previous prime is 66779321113. The next prime is 66779321209. The reversal of 66779321208 is 80212397766.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66779321209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1391235835 + ... + 1391235882.

Almost surely, 2^66779321208 is an apocalyptic number.

It is an amenable number.

66779321208 is an abundant number, since it is smaller than the sum of its proper divisors (100168981872).

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

66779321208 is a wasteful number, since it uses less digits than its factorization.

66779321208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782471726 (or 2782471722 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 51.

The spelling of 66779321208 in words is "sixty-six billion, seven hundred seventy-nine million, three hundred twenty-one thousand, two hundred eight".