640112015 has 4 divisors (see below), whose sum is σ = 768134424. Its totient is φ = 512089608.

The previous prime is 640112003. The next prime is 640112017. The reversal of 640112015 is 510211046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640112015 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640112017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64011197 + ... + 64011206.

It is an arithmetic number, because the mean of its divisors is an integer number (192033606).

Almost surely, 2^640112015 is an apocalyptic number.

640112015 is a deficient number, since it is larger than the sum of its proper divisors (128022409).

640112015 is a wasteful number, since it uses less digits than its factorization.

640112015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128022408.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 640112015 is about 25300.4350753105. The cubic root of 640112015 is about 861.8241499552.

The spelling of 640112015 in words is "six hundred forty million, one hundred twelve thousand, fifteen".