640165465 has 16 divisors (see below), whose sum is σ = 781401600. Its totient is φ = 503375040.

The previous prime is 640165457. The next prime is 640165483. The reversal of 640165465 is 564561046.

It is not a de Polignac number, because 640165465 - 2³ = 640165457 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, 121312 + ... + 126478.

It is an arithmetic number, because the mean of its divisors is an integer number (48837600).

Almost surely, 2^640165465 is an apocalyptic number.

It is an amenable number.

640165465 is a deficient number, since it is larger than the sum of its proper divisors (141236135).

640165465 is a wasteful number, since it uses less digits than its factorization.

640165465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5592.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 640165465 is about 25301.4913592065. The cubic root of 640165465 is about 861.8481370167.

The spelling of 640165465 in words is "six hundred forty million, one hundred sixty-five thousand, four hundred sixty-five".