66415373 has 2 divisors, whose sum is σ = 66415374. Its totient is φ = 66415372.

The previous prime is 66415369. The next prime is 66415463. The reversal of 66415373 is 37351466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40170244 + 26245129 = 6338^2 + 5123^2 .

It is a cyclic number.

It is not a de Polignac number, because 66415373 - 2² = 66415369 is a prime.

It is a super-2 number, since 2×66415373² = 8822003541458258, which contains 22 as substring.

It is equal to p_3919337 and since 66415373 and 3919337 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66415273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33207686 + 33207687.

It is an arithmetic number, because the mean of its divisors is an integer number (33207687).

Almost surely, 2^66415373 is an apocalyptic number.

It is an amenable number.

66415373 is a deficient number, since it is larger than the sum of its proper divisors (1).

66415373 is an equidigital number, since it uses as much as digits as its factorization.

66415373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 35.

The square root of 66415373 is about 8149.5627490068. The cubic root of 66415373 is about 404.9700186107.

The spelling of 66415373 in words is "sixty-six million, four hundred fifteen thousand, three hundred seventy-three".