25378851915 has 24 divisors (see below), whose sum is σ = 44009540640. Its totient is φ = 13529378304.

The previous prime is 25378851887. The next prime is 25378851959. The reversal of 25378851915 is 51915887352.

25378851915 is a `hidden beast` number, since 2 + 5 + 37 + 88 + 519 + 15 = 666.

It is not a de Polignac number, because 25378851915 - 2¹⁸ = 25378589771 is a prime.

It is a super-2 number, since 2×25378851915² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21775 + ... + 226344.

It is an arithmetic number, because the mean of its divisors is an integer number (1833730860).

Almost surely, 2^25378851915 is an apocalyptic number.

25378851915 is a deficient number, since it is larger than the sum of its proper divisors (18630688725).

25378851915 is a wasteful number, since it uses less digits than its factorization.

25378851915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250403 (or 250400 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 54.

The spelling of 25378851915 in words is "twenty-five billion, three hundred seventy-eight million, eight hundred fifty-one thousand, nine hundred fifteen".