66791319 has 16 divisors (see below), whose sum is σ = 101982720. Its totient is φ = 38089440.

The previous prime is 66791297. The next prime is 66791339. The reversal of 66791319 is 91319766.

It is not a de Polignac number, because 66791319 - 2²³ = 58402711 is a prime.

It is a super-2 number, since 2×66791319² = 8922160587519522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66791339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8422 + ... + 14300.

It is an arithmetic number, because the mean of its divisors is an integer number (6373920).

Almost surely, 2^66791319 is an apocalyptic number.

66791319 is a deficient number, since it is larger than the sum of its proper divisors (35191401).

66791319 is a wasteful number, since it uses less digits than its factorization.

66791319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6430.

The product of its digits is 61236, while the sum is 42.

The square root of 66791319 is about 8172.5956097191. The cubic root of 66791319 is about 405.7326959143.

The spelling of 66791319 in words is "sixty-six million, seven hundred ninety-one thousand, three hundred nineteen".