66998675272 has 16 divisors (see below), whose sum is σ = 125895023100. Its totient is φ = 33426669120.

The previous prime is 66998675221. The next prime is 66998675339. The reversal of 66998675272 is 27257689966.

It can be written as a sum of positive squares in 2 ways, for example, as 61506976036 + 5491699236 = 248006^2 + 74106^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66998675198 and 66998675207.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9079647 + ... + 9087022.

Almost surely, 2^66998675272 is an apocalyptic number.

It is an amenable number.

66998675272 is a deficient number, since it is larger than the sum of its proper divisors (58896347828).

66998675272 is a wasteful number, since it uses less digits than its factorization.

66998675272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18167136 (or 18167132 counting only the distinct ones).

The product of its digits is 137168640, while the sum is 67.

The spelling of 66998675272 in words is "sixty-six billion, nine hundred ninety-eight million, six hundred seventy-five thousand, two hundred seventy-two".