640142400065 has 16 divisors (see below), whose sum is σ = 886601756160. Its totient is φ = 434608699200.

The previous prime is 640142400059. The next prime is 640142400091. The reversal of 640142400065 is 560004241046.

It is not a de Polignac number, because 640142400065 - 2¹⁶ = 640142334529 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90539945 + ... + 90547014.

It is an arithmetic number, because the mean of its divisors is an integer number (55412609760).

Almost surely, 2^640142400065 is an apocalyptic number.

It is an amenable number.

640142400065 is a deficient number, since it is larger than the sum of its proper divisors (246459356095).

640142400065 is a wasteful number, since it uses less digits than its factorization.

640142400065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181087072.

The product of its (nonzero) digits is 23040, while the sum is 32.

The spelling of 640142400065 in words is "six hundred forty billion, one hundred forty-two million, four hundred thousand, sixty-five".