25851317995 has 32 divisors (see below), whose sum is σ = 31791513600. Its totient is φ = 20176200576.

The previous prime is 25851317993. The next prime is 25851318007. The reversal of 25851317995 is 59971315852.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25851317995 - 2¹ = 25851317993 is a prime.

It is a super-2 number, since 2×25851317995² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25851317993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9619542 + ... + 9622228.

It is an arithmetic number, because the mean of its divisors is an integer number (993484800).

Almost surely, 2^25851317995 is an apocalyptic number.

25851317995 is a deficient number, since it is larger than the sum of its proper divisors (5940195605).

25851317995 is a wasteful number, since it uses less digits than its factorization.

25851317995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3067.

The product of its digits is 3402000, while the sum is 55.

The spelling of 25851317995 in words is "twenty-five billion, eight hundred fifty-one million, three hundred seventeen thousand, nine hundred ninety-five".