25279942257 has 12 divisors (see below), whose sum is σ = 37060480080. Its totient is φ = 16601752728.

The previous prime is 25279942253. The next prime is 25279942277. The reversal of 25279942257 is 75224997252.

25279942257 is a `hidden beast` number, since 2 + 527 + 9 + 94 + 2 + 25 + 7 = 666.

It is not a de Polignac number, because 25279942257 - 2² = 25279942253 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (25279942253) 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 11 ways as a sum of consecutive naturals, for example, 20961207 + ... + 20962412.

It is an arithmetic number, because the mean of its divisors is an integer number (3088373340).

Almost surely, 2^25279942257 is an apocalyptic number.

It is an amenable number.

25279942257 is a deficient number, since it is larger than the sum of its proper divisors (11780537823).

25279942257 is a wasteful number, since it uses less digits than its factorization.

25279942257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41923692 (or 41923689 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 54.

The spelling of 25279942257 in words is "twenty-five billion, two hundred seventy-nine million, nine hundred forty-two thousand, two hundred fifty-seven".