66769413778938 has 32 divisors (see below), whose sum is σ = 143834844033216. Its totient is φ = 20541035155968.

The previous prime is 66769413778913. The next prime is 66769413778957. The reversal of 66769413778938 is 83987731496766.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70355895 + ... + 71298602.

It is an arithmetic number, because the mean of its divisors is an integer number (4494838876038).

Almost surely, 2^{66769413778938} is an apocalyptic number.

66769413778938 is an abundant number, since it is smaller than the sum of its proper divisors (77065430254278).

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

66769413778938 is a wasteful number, since it uses less digits than its factorization.

66769413778938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141660558.

The product of its digits is 13826598912, while the sum is 84.

The spelling of 66769413778938 in words is "sixty-six trillion, seven hundred sixty-nine billion, four hundred thirteen million, seven hundred seventy-eight thousand, nine hundred thirty-eight".