655665615 has 24 divisors (see below), whose sum is σ = 1239805008. Its totient is φ = 317898240.

The previous prime is 655665601. The next prime is 655665631. The reversal of 655665615 is 516566556.

It is not a de Polignac number, because 655665615 - 2⁸ = 655665359 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 661794 + ... + 662783.

It is an arithmetic number, because the mean of its divisors is an integer number (51658542).

Almost surely, 2^655665615 is an apocalyptic number.

655665615 is a deficient number, since it is larger than the sum of its proper divisors (584139393).

655665615 is a wasteful number, since it uses less digits than its factorization.

655665615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324599 (or 1324596 counting only the distinct ones).

The product of its digits is 810000, while the sum is 45.

The square root of 655665615 is about 25605.9683472428. The cubic root of 655665615 is about 868.7486369559.

The spelling of 655665615 in words is "six hundred fifty-five million, six hundred sixty-five thousand, six hundred fifteen".