66979257992 has 16 divisors (see below), whose sum is σ = 128980328460. Its totient is φ = 32584503744.

The previous prime is 66979257949. The next prime is 66979258013. The reversal of 66979257992 is 29975297966.

It can be written as a sum of positive squares in 2 ways, for example, as 65778912676 + 1200345316 = 256474^2 + 34646^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113140343 + ... + 113140934.

Almost surely, 2^66979257992 is an apocalyptic number.

It is an amenable number.

66979257992 is a deficient number, since it is larger than the sum of its proper divisors (62001070468).

66979257992 is a wasteful number, since it uses less digits than its factorization.

66979257992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226281320 (or 226281316 counting only the distinct ones).

The product of its digits is 231472080, while the sum is 71.

The spelling of 66979257992 in words is "sixty-six billion, nine hundred seventy-nine million, two hundred fifty-seven thousand, nine hundred ninety-two".