645235515 has 24 divisors (see below), whose sum is σ = 1139514480. Its totient is φ = 337631424.

The previous prime is 645235501. The next prime is 645235523. The reversal of 645235515 is 515532546.

645235515 is a `hidden beast` number, since 64 + 52 + 35 + 515 = 666.

It is not a de Polignac number, because 645235515 - 2⁴ = 645235499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645235515.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132885 + ... + 137654.

It is an arithmetic number, because the mean of its divisors is an integer number (47479770).

Almost surely, 2^645235515 is an apocalyptic number.

645235515 is a deficient number, since it is larger than the sum of its proper divisors (494278965).

645235515 is a wasteful number, since it uses less digits than its factorization.

645235515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270603 (or 270600 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The square root of 645235515 is about 25401.4864722520. The cubic root of 645235515 is about 864.1174086524.

The spelling of 645235515 in words is "six hundred forty-five million, two hundred thirty-five thousand, five hundred fifteen".