25493315679 has 32 divisors (see below), whose sum is σ = 42075633600. Its totient is φ = 15147216000.

The previous prime is 25493315633. The next prime is 25493315707. The reversal of 25493315679 is 97651339452.

25493315679 is a `hidden beast` number, since 2 + 5 + 49 + 3 + 31 + 567 + 9 = 666.

It is not a de Polignac number, because 25493315679 - 2¹² = 25493311583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25493315609) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1242072 + ... + 1262429.

It is an arithmetic number, because the mean of its divisors is an integer number (1314863550).

Almost surely, 2^25493315679 is an apocalyptic number.

25493315679 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

25493315679 is a deficient number, since it is larger than the sum of its proper divisors (16582317921).

25493315679 is a wasteful number, since it uses less digits than its factorization.

25493315679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504552 (or 2504546 counting only the distinct ones).

The product of its digits is 6123600, while the sum is 54.

The spelling of 25493315679 in words is "twenty-five billion, four hundred ninety-three million, three hundred fifteen thousand, six hundred seventy-nine".