25615056715 has 4 divisors (see below), whose sum is σ = 30738068064. Its totient is φ = 20492045368.

The previous prime is 25615056707. The next prime is 25615056763. The reversal of 25615056715 is 51765051652.

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 25615056715 - 2³ = 25615056707 is a prime.

It is a super-2 number, since 2×25615056715² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2561505667 + ... + 2561505676.

It is an arithmetic number, because the mean of its divisors is an integer number (7684517016).

Almost surely, 2^25615056715 is an apocalyptic number.

25615056715 is a deficient number, since it is larger than the sum of its proper divisors (5123011349).

25615056715 is an equidigital number, since it uses as much as digits as its factorization.

25615056715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5123011348.

The product of its (nonzero) digits is 315000, while the sum is 43.

The spelling of 25615056715 in words is "twenty-five billion, six hundred fifteen million, fifty-six thousand, seven hundred fifteen".