642165015 has 16 divisors (see below), whose sum is σ = 1027778400. Its totient is φ = 342383232.

The previous prime is 642164989. The next prime is 642165019. The reversal of 642165015 is 510561246.

It is not a de Polignac number, because 642165015 - 2⁸ = 642164759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642165019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90621 + ... + 97449.

It is an arithmetic number, because the mean of its divisors is an integer number (64236150).

Almost surely, 2^642165015 is an apocalyptic number.

642165015 is a deficient number, since it is larger than the sum of its proper divisors (385613385).

642165015 is a wasteful number, since it uses less digits than its factorization.

642165015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13106.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 642165015 is about 25340.9750207051. The cubic root of 642165015 is about 862.7445288603.

The spelling of 642165015 in words is "six hundred forty-two million, one hundred sixty-five thousand, fifteen".