66412415 has 16 divisors (see below), whose sum is σ = 82295136. Its totient is φ = 51417600.

The previous prime is 66412397. The next prime is 66412433. The reversal of 66412415 is 51421466.

It is an interprime number because it is at equal distance from previous prime (66412397) and next prime (66412433).

It is not a de Polignac number, because 66412415 - 2²⁴ = 49635199 is a prime.

It is a super-2 number, since 2×66412415² = 8821217732264450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25619 + ... + 28091.

It is an arithmetic number, because the mean of its divisors is an integer number (5143446).

Almost surely, 2^66412415 is an apocalyptic number.

66412415 is a deficient number, since it is larger than the sum of its proper divisors (15882721).

66412415 is a wasteful number, since it uses less digits than its factorization.

66412415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650.

The product of its digits is 5760, while the sum is 29.

The square root of 66412415 is about 8149.3812648569. The cubic root of 66412415 is about 404.9640063526.

The spelling of 66412415 in words is "sixty-six million, four hundred twelve thousand, four hundred fifteen".