2556016615 has 4 divisors (see below), whose sum is σ = 3067219944. Its totient is φ = 2044813288.

The previous prime is 2556016597. The next prime is 2556016627. The reversal of 2556016615 is 5166106552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2556016615 - 2⁹ = 2556016103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255601657 + ... + 255601666.

It is an arithmetic number, because the mean of its divisors is an integer number (766804986).

Almost surely, 2^2556016615 is an apocalyptic number.

2556016615 is a deficient number, since it is larger than the sum of its proper divisors (511203329).

2556016615 is an equidigital number, since it uses as much as digits as its factorization.

2556016615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511203328.

The product of its (nonzero) digits is 54000, while the sum is 37.

The square root of 2556016615 is about 50557.0629586015. The cubic root of 2556016615 is about 1367.2708585382.

The spelling of 2556016615 in words is "two billion, five hundred fifty-six million, sixteen thousand, six hundred fifteen".