64525657 has 4 divisors (see below), whose sum is σ = 73743616. Its totient is φ = 55307700.

The previous prime is 64525651. The next prime is 64525673. The reversal of 64525657 is 75652546.

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 not a de Polignac number, because 64525657 - 2⁷ = 64525529 is a prime.

It is a super-2 number, since 2×64525657² = 8327120822563298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64525651) 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, 4608969 + ... + 4608982.

It is an arithmetic number, because the mean of its divisors is an integer number (18435904).

Almost surely, 2^64525657 is an apocalyptic number.

It is an amenable number.

64525657 is a deficient number, since it is larger than the sum of its proper divisors (9217959).

64525657 is an equidigital number, since it uses as much as digits as its factorization.

64525657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9217958.

The product of its digits is 252000, while the sum is 40.

The square root of 64525657 is about 8032.7863783372. The cubic root of 64525657 is about 401.0921341437.

The spelling of 64525657 in words is "sixty-four million, five hundred twenty-five thousand, six hundred fifty-seven".