66873772680 has 128 divisors (see below), whose sum is σ = 235695035520. Its totient is φ = 14964756480.

The previous prime is 66873772639. The next prime is 66873772681. The reversal of 66873772680 is 8627737866.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (66873772681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1931377 + ... + 1965696.

It is an arithmetic number, because the mean of its divisors is an integer number (1841367465).

Almost surely, 2^66873772680 is an apocalyptic number.

66873772680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66873772680 is an abundant number, since it is smaller than the sum of its proper divisors (168821262840).

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

66873772680 is a wasteful number, since it uses less digits than its factorization.

66873772680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3897111 (or 3897107 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 60.

The spelling of 66873772680 in words is "sixty-six billion, eight hundred seventy-three million, seven hundred seventy-two thousand, six hundred eighty".