64525613 has 4 divisors (see below), whose sum is σ = 64581888. Its totient is φ = 64469340.

The previous prime is 64525589. The next prime is 64525619. The reversal of 64525613 is 31652546.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31652546 = 2 ⋅15826273.

It is a cyclic number.

It is not a de Polignac number, because 64525613 - 2¹² = 64521517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64525613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64525619) 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, 26381 + ... + 28722.

It is an arithmetic number, because the mean of its divisors is an integer number (16145472).

Almost surely, 2^64525613 is an apocalyptic number.

It is an amenable number.

64525613 is a deficient number, since it is larger than the sum of its proper divisors (56275).

64525613 is a wasteful number, since it uses less digits than its factorization.

64525613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56274.

The product of its digits is 21600, while the sum is 32.

The square root of 64525613 is about 8032.7836395611. The cubic root of 64525613 is about 401.0920429755.

The spelling of 64525613 in words is "sixty-four million, five hundred twenty-five thousand, six hundred thirteen".