66779398661184 has 126 divisors (see below), whose sum is σ = 210394006994990. Its totient is φ = 20236181391360.

The previous prime is 66779398661141. The next prime is 66779398661207. The reversal of 66779398661184 is 48116689397766.

It can be written as a sum of positive squares in only one way, i.e., 66740403470400 + 38995190784 = 8169480^2 + 197472^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 479006569 + ... + 479145960.

Almost surely, 2^{66779398661184} is an apocalyptic number.

66779398661184 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66779398661184 is an abundant number, since it is smaller than the sum of its proper divisors (143614608333806).

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

66779398661184 is a wasteful number, since it uses less digits than its factorization.

66779398661184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958152569 (or 958152545 counting only the distinct ones).

The product of its digits is 3950456832, while the sum is 81.

The spelling of 66779398661184 in words is "sixty-six trillion, seven hundred seventy-nine billion, three hundred ninety-eight million, six hundred sixty-one thousand, one hundred eighty-four".