655607515 has 4 divisors (see below), whose sum is σ = 786729024. Its totient is φ = 524486008.

The previous prime is 655607503. The next prime is 655607543. The reversal of 655607515 is 515706556.

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-655607515 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65560747 + ... + 65560756.

It is an arithmetic number, because the mean of its divisors is an integer number (196682256).

Almost surely, 2^655607515 is an apocalyptic number.

655607515 is a deficient number, since it is larger than the sum of its proper divisors (131121509).

655607515 is a wasteful number, since it uses less digits than its factorization.

655607515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131121508.

The product of its (nonzero) digits is 157500, while the sum is 40.

The square root of 655607515 is about 25604.8338209800. The cubic root of 655607515 is about 868.7229756098.

The spelling of 655607515 in words is "six hundred fifty-five million, six hundred seven thousand, five hundred fifteen".