64915566 has 16 divisors (see below), whose sum is σ = 132281424. Its totient is φ = 21230144.

The previous prime is 64915559. The next prime is 64915567. The reversal of 64915566 is 66551946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64915567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101751 + ... + 102386.

It is an arithmetic number, because the mean of its divisors is an integer number (8267589).

Almost surely, 2^64915566 is an apocalyptic number.

64915566 is an abundant number, since it is smaller than the sum of its proper divisors (67365858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64915566 is a wasteful number, since it uses less digits than its factorization.

64915566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204195.

The product of its digits is 194400, while the sum is 42.

The square root of 64915566 is about 8057.0196723106. The cubic root of 64915566 is about 401.8984050586.

The spelling of 64915566 in words is "sixty-four million, nine hundred fifteen thousand, five hundred sixty-six".