66831197 has 4 divisors (see below), whose sum is σ = 66884256. Its totient is φ = 66778140.

The previous prime is 66831181. The next prime is 66831211. The reversal of 66831197 is 79113866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66831197 - 2⁴ = 66831181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66839197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24593 + ... + 27174.

It is an arithmetic number, because the mean of its divisors is an integer number (16721064).

Almost surely, 2^66831197 is an apocalyptic number.

It is an amenable number.

66831197 is a deficient number, since it is larger than the sum of its proper divisors (53059).

66831197 is a wasteful number, since it uses less digits than its factorization.

66831197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53058.

The product of its digits is 54432, while the sum is 41.

The square root of 66831197 is about 8175.0349846346. The cubic root of 66831197 is about 405.8134279101.

The spelling of 66831197 in words is "sixty-six million, eight hundred thirty-one thousand, one hundred ninety-seven".