66412769 has 4 divisors (see below), whose sum is σ = 67957296. Its totient is φ = 64868244.

The previous prime is 66412741. The next prime is 66412783. The reversal of 66412769 is 96721466.

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 a de Polignac number, because none of the positive numbers 2^k-66412769 is a prime.

It is a super-2 number, since 2×66412769² = 8821311772494722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66412729) 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, 772199 + ... + 772284.

It is an arithmetic number, because the mean of its divisors is an integer number (16989324).

Almost surely, 2^66412769 is an apocalyptic number.

It is an amenable number.

66412769 is a deficient number, since it is larger than the sum of its proper divisors (1544527).

66412769 is a wasteful number, since it uses less digits than its factorization.

66412769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544526.

The product of its digits is 108864, while the sum is 41.

The square root of 66412769 is about 8149.4029842682. The cubic root of 66412769 is about 404.9647258818.

The spelling of 66412769 in words is "sixty-six million, four hundred twelve thousand, seven hundred sixty-nine".