25315015613 has 4 divisors (see below), whose sum is σ = 25315596768. Its totient is φ = 25314434460.

The previous prime is 25315015603. The next prime is 25315015637. The reversal of 25315015613 is 31651051352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25315015613 - 2⁸ = 25315015357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25315015613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25315015603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219431 + ... + 314292.

It is an arithmetic number, because the mean of its divisors is an integer number (6328899192).

Almost surely, 2^25315015613 is an apocalyptic number.

It is an amenable number.

25315015613 is a deficient number, since it is larger than the sum of its proper divisors (581155).

25315015613 is an equidigital number, since it uses as much as digits as its factorization.

25315015613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581154.

The product of its (nonzero) digits is 13500, while the sum is 32.

Adding to 25315015613 its reverse (31651051352), we get a palindrome (56966066965).

The spelling of 25315015613 in words is "twenty-five billion, three hundred fifteen million, fifteen thousand, six hundred thirteen".