64663665 has 32 divisors (see below), whose sum is σ = 119511936. Its totient is φ = 29506560.

The previous prime is 64663663. The next prime is 64663667. The reversal of 64663665 is 56636646.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64663663) and next prime (64663667).

It is not a de Polignac number, because 64663665 - 2¹ = 64663663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64663661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8722 + ... + 14331.

It is an arithmetic number, because the mean of its divisors is an integer number (3734748).

Almost surely, 2^64663665 is an apocalyptic number.

It is an amenable number.

64663665 is a deficient number, since it is larger than the sum of its proper divisors (54848271).

64663665 is a wasteful number, since it uses less digits than its factorization.

64663665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23089.

The product of its digits is 466560, while the sum is 42.

The square root of 64663665 is about 8041.3720844145. The cubic root of 64663665 is about 401.3778835589.

The spelling of 64663665 in words is "sixty-four million, six hundred sixty-three thousand, six hundred sixty-five".