25251265161 has 16 divisors (see below), whose sum is σ = 37425409920. Its totient is φ = 16826919120.

The previous prime is 25251265159. The next prime is 25251265177. The reversal of 25251265161 is 16156215252.

25251265161 is a `hidden beast` number, since 2 + 525 + 1 + 26 + 51 + 61 = 666.

It is not a de Polignac number, because 25251265161 - 2¹ = 25251265159 is a prime.

It is a super-2 number, since 2×25251265161² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25251265181) 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, 137445 + ... + 263426.

It is an arithmetic number, because the mean of its divisors is an integer number (2339088120).

Almost surely, 2^25251265161 is an apocalyptic number.

It is an amenable number.

25251265161 is a deficient number, since it is larger than the sum of its proper divisors (12174144759).

25251265161 is a wasteful number, since it uses less digits than its factorization.

25251265161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403213 (or 403207 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The spelling of 25251265161 in words is "twenty-five billion, two hundred fifty-one million, two hundred sixty-five thousand, one hundred sixty-one".