64255665 has 16 divisors (see below), whose sum is σ = 108857088. Its totient is φ = 32253696.

The previous prime is 64255657. The next prime is 64255673. The reversal of 64255665 is 56655246.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64255657) and next prime (64255673).

It is not a de Polignac number, because 64255665 - 2³ = 64255657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125737 + ... + 126246.

It is an arithmetic number, because the mean of its divisors is an integer number (6803568).

Almost surely, 2^64255665 is an apocalyptic number.

It is an amenable number.

64255665 is a deficient number, since it is larger than the sum of its proper divisors (44601423).

64255665 is a wasteful number, since it uses less digits than its factorization.

64255665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252008.

The product of its digits is 216000, while the sum is 39.

The square root of 64255665 is about 8015.9631361428. The cubic root of 64255665 is about 400.5319277353.

It can be divided in two parts, 6425 and 5665, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 64255665 in words is "sixty-four million, two hundred fifty-five thousand, six hundred sixty-five".