25312561415 has 4 divisors (see below), whose sum is σ = 30375073704. Its totient is φ = 20250049128.

The previous prime is 25312561411. The next prime is 25312561423. The reversal of 25312561415 is 51416521352.

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 25312561415 - 2² = 25312561411 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25312561411) 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, 2531256137 + ... + 2531256146.

It is an arithmetic number, because the mean of its divisors is an integer number (7593768426).

Almost surely, 2^25312561415 is an apocalyptic number.

25312561415 is a deficient number, since it is larger than the sum of its proper divisors (5062512289).

25312561415 is an equidigital number, since it uses as much as digits as its factorization.

25312561415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5062512288.

The product of its digits is 36000, while the sum is 35.

The spelling of 25312561415 in words is "twenty-five billion, three hundred twelve million, five hundred sixty-one thousand, four hundred fifteen".