66039625 has 8 divisors (see below), whose sum is σ = 82417608. Its totient is φ = 52831600.

The previous prime is 66039607. The next prime is 66039629. The reversal of 66039625 is 52693066.

It can be written as a sum of positive squares in 4 ways, for example, as 9308601 + 56731024 = 3051^2 + 7532^2 .

It is not a de Polignac number, because 66039625 - 2¹⁷ = 65908553 is a prime.

It is a super-2 number, since 2×66039625² = 8722464140281250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66039629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264034 + ... + 264283.

It is an arithmetic number, because the mean of its divisors is an integer number (10302201).

Almost surely, 2^66039625 is an apocalyptic number.

It is an amenable number.

66039625 is a deficient number, since it is larger than the sum of its proper divisors (16377983).

66039625 is an equidigital number, since it uses as much as digits as its factorization.

66039625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528332 (or 528322 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 66039625 is about 8126.4767888674. The cubic root of 66039625 is about 404.2048617084.

The spelling of 66039625 in words is "sixty-six million, thirty-nine thousand, six hundred twenty-five".