25172355813 has 16 divisors (see below), whose sum is σ = 36618447936. Its totient is φ = 15254259840.

The previous prime is 25172355797. The next prime is 25172355823. The reversal of 25172355813 is 31855327152.

It is not a de Polignac number, because 25172355813 - 2⁴ = 25172355797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25172355823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295281 + ... + 370857.

It is an arithmetic number, because the mean of its divisors is an integer number (2288652996).

Almost surely, 2^25172355813 is an apocalyptic number.

It is an amenable number.

25172355813 is a deficient number, since it is larger than the sum of its proper divisors (11446092123).

25172355813 is a wasteful number, since it uses less digits than its factorization.

25172355813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85684.

The product of its digits is 252000, while the sum is 42.

The spelling of 25172355813 in words is "twenty-five billion, one hundred seventy-two million, three hundred fifty-five thousand, eight hundred thirteen".