645610515015 has 16 divisors (see below), whose sum is σ = 1033690733568. Its totient is φ = 344087638176.

The previous prime is 645610515013. The next prime is 645610515019. The reversal of 645610515015 is 510515016546.

It is not a de Polignac number, because 645610515015 - 2¹ = 645610515013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645610515013) 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, 14850687 + ... + 14894096.

It is an arithmetic number, because the mean of its divisors is an integer number (64605670848).

Almost surely, 2^645610515015 is an apocalyptic number.

645610515015 is a deficient number, since it is larger than the sum of its proper divisors (388080218553).

645610515015 is a wasteful number, since it uses less digits than its factorization.

645610515015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29746238.

The product of its (nonzero) digits is 90000, while the sum is 39.

The spelling of 645610515015 in words is "six hundred forty-five billion, six hundred ten million, five hundred fifteen thousand, fifteen".