66944979231 has 16 divisors (see below), whose sum is σ = 98724129504. Its totient is φ = 40083479424.

The previous prime is 66944979223. The next prime is 66944979313. The reversal of 66944979231 is 13297944966.

It is not a de Polignac number, because 66944979231 - 2³ = 66944979223 is a prime.

It is a super-2 number, since 2×66944979231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66944979931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23195016 + ... + 23197901.

It is an arithmetic number, because the mean of its divisors is an integer number (6170258094).

Almost surely, 2^66944979231 is an apocalyptic number.

66944979231 is a deficient number, since it is larger than the sum of its proper divisors (31779150273).

66944979231 is a wasteful number, since it uses less digits than its factorization.

66944979231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46392970.

The product of its digits is 17635968, while the sum is 60.

The spelling of 66944979231 in words is "sixty-six billion, nine hundred forty-four million, nine hundred seventy-nine thousand, two hundred thirty-one".