64375661 has 12 divisors (see below), whose sum is σ = 75343968. Its totient is φ = 54841752.

The previous prime is 64375657. The next prime is 64375669. The reversal of 64375661 is 16657346.

It is a happy number.

It is not a de Polignac number, because 64375661 - 2² = 64375657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64375669) 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, 4250 + ... + 12116.

It is an arithmetic number, because the mean of its divisors is an integer number (6278664).

Almost surely, 2^64375661 is an apocalyptic number.

It is an amenable number.

64375661 is a deficient number, since it is larger than the sum of its proper divisors (10968307).

64375661 is a wasteful number, since it uses less digits than its factorization.

64375661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8048 (or 8041 counting only the distinct ones).

The product of its digits is 90720, while the sum is 38.

The square root of 64375661 is about 8023.4444598315. Note that the first 4 decimals coincide. The cubic root of 64375661 is about 400.7811007944.

The spelling of 64375661 in words is "sixty-four million, three hundred seventy-five thousand, six hundred sixty-one".