668792571 has 12 divisors (see below), whose sum is σ = 941127912. Its totient is φ = 422394624.

The previous prime is 668792567. The next prime is 668792581. The reversal of 668792571 is 175297866.

It is not a de Polignac number, because 668792571 - 2² = 668792567 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668792521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 307686 + ... + 309851.

It is an arithmetic number, because the mean of its divisors is an integer number (78427326).

Almost surely, 2^668792571 is an apocalyptic number.

668792571 is a deficient number, since it is larger than the sum of its proper divisors (272335341).

668792571 is a wasteful number, since it uses less digits than its factorization.

668792571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617578 (or 617559 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 51.

The square root of 668792571 is about 25861.0241676543. The cubic root of 668792571 is about 874.5080536989.

The spelling of 668792571 in words is "six hundred sixty-eight million, seven hundred ninety-two thousand, five hundred seventy-one".