66197131 has 24 divisors (see below), whose sum is σ = 89385984. Its totient is φ = 47604960.

The previous prime is 66197129. The next prime is 66197141. The reversal of 66197131 is 13179166.

It is not a de Polignac number, because 66197131 - 2¹ = 66197129 is a prime.

It is a super-2 number, since 2×66197131² = 8764120305262322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66197141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10470 + ... + 15556.

It is an arithmetic number, because the mean of its divisors is an integer number (3724416).

Almost surely, 2^66197131 is an apocalyptic number.

66197131 is a deficient number, since it is larger than the sum of its proper divisors (23188853).

66197131 is a wasteful number, since it uses less digits than its factorization.

66197131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5131 (or 5118 counting only the distinct ones).

The product of its digits is 6804, while the sum is 34.

The square root of 66197131 is about 8136.1619330001. The cubic root of 66197131 is about 404.5259524879.

The spelling of 66197131 in words is "sixty-six million, one hundred ninety-seven thousand, one hundred thirty-one".