640235644015 has 16 divisors (see below), whose sum is σ = 838499158656. Its totient is φ = 465418980000.

The previous prime is 640235644003. The next prime is 640235644021. The reversal of 640235644015 is 510446532046.

It is not a de Polignac number, because 640235644015 - 2⁹ = 640235643503 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 2461857 + ... + 2709466.

It is an arithmetic number, because the mean of its divisors is an integer number (52406197416).

Almost surely, 2^640235644015 is an apocalyptic number.

640235644015 is a deficient number, since it is larger than the sum of its proper divisors (198263514641).

640235644015 is a wasteful number, since it uses less digits than its factorization.

640235644015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5173590.

The product of its (nonzero) digits is 345600, while the sum is 40.

The spelling of 640235644015 in words is "six hundred forty billion, two hundred thirty-five million, six hundred forty-four thousand, fifteen".