66131392 has 14 divisors (see below), whose sum is σ = 131229608. Its totient is φ = 33065664.

The previous prime is 66131369. The next prime is 66131393. The reversal of 66131392 is 29313166.

It is a super-2 number, since 2×66131392² = 8746722015715328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66131393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 516588 + ... + 516715.

Almost surely, 2^66131392 is an apocalyptic number.

It is an amenable number.

66131392 is a deficient number, since it is larger than the sum of its proper divisors (65098216).

66131392 is a wasteful number, since it uses less digits than its factorization.

66131392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033315 (or 1033305 counting only the distinct ones).

The product of its digits is 5832, while the sum is 31.

The square root of 66131392 is about 8132.1210025429. The cubic root of 66131392 is about 404.3919993538.

The spelling of 66131392 in words is "sixty-six million, one hundred thirty-one thousand, three hundred ninety-two".