66413957 has 4 divisors (see below), whose sum is σ = 67254720. Its totient is φ = 65573196.

The previous prime is 66413939. The next prime is 66413969. The reversal of 66413957 is 75931466.

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 66413957 - 2¹⁰ = 66412933 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 (66413057) 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, 420263 + ... + 420420.

It is an arithmetic number, because the mean of its divisors is an integer number (16813680).

Almost surely, 2^66413957 is an apocalyptic number.

It is an amenable number.

66413957 is a deficient number, since it is larger than the sum of its proper divisors (840763).

66413957 is an equidigital number, since it uses as much as digits as its factorization.

66413957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840762.

The product of its digits is 136080, while the sum is 41.

The square root of 66413957 is about 8149.4758727172. The cubic root of 66413957 is about 404.9671405541.

The spelling of 66413957 in words is "sixty-six million, four hundred thirteen thousand, nine hundred fifty-seven".