64510665 has 16 divisors (see below), whose sum is σ = 109289088. Its totient is φ = 32381696.

The previous prime is 64510661. The next prime is 64510679. The reversal of 64510665 is 56601546.

It is a cyclic number.

It is not a de Polignac number, because 64510665 - 2² = 64510661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64510661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126237 + ... + 126746.

It is an arithmetic number, because the mean of its divisors is an integer number (6830568).

Almost surely, 2^64510665 is an apocalyptic number.

It is an amenable number.

64510665 is a deficient number, since it is larger than the sum of its proper divisors (44778423).

64510665 is a wasteful number, since it uses less digits than its factorization.

64510665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253008.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 64510665 is about 8031.8531485579. The cubic root of 64510665 is about 401.0610682632.

The spelling of 64510665 in words is "sixty-four million, five hundred ten thousand, six hundred sixty-five".