256615602505 has 8 divisors (see below), whose sum is σ = 307975594752. Its totient is φ = 205267900848.

The previous prime is 256615602457. The next prime is 256615602511. The reversal of 256615602505 is 505206516652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256615602505 - 2¹⁷ = 256615471433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3026649 + ... + 3110278.

It is an arithmetic number, because the mean of its divisors is an integer number (38496949344).

Almost surely, 2^256615602505 is an apocalyptic number.

It is an amenable number.

256615602505 is a deficient number, since it is larger than the sum of its proper divisors (51359992247).

256615602505 is an equidigital number, since it uses as much as digits as its factorization.

256615602505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6145295.

The product of its (nonzero) digits is 540000, while the sum is 43.

The spelling of 256615602505 in words is "two hundred fifty-six billion, six hundred fifteen million, six hundred two thousand, five hundred five".