64612521 has 12 divisors (see below), whose sum is σ = 98241520. Its totient is φ = 40807800.

The previous prime is 64612517. The next prime is 64612547. The reversal of 64612521 is 12521646.

64612521 is a `hidden beast` number, since 646 + 12 + 5 + 2 + 1 = 666.

It is not a de Polignac number, because 64612521 - 2² = 64612517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64612501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188755 + ... + 189096.

Almost surely, 2^64612521 is an apocalyptic number.

It is an amenable number.

64612521 is a deficient number, since it is larger than the sum of its proper divisors (33628999).

64612521 is a wasteful number, since it uses less digits than its factorization.

64612521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377876 (or 377873 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 64612521 is about 8038.1914010553. The cubic root of 64612521 is about 401.2720359401.

The spelling of 64612521 in words is "sixty-four million, six hundred twelve thousand, five hundred twenty-one".