25401203251 has 16 divisors (see below), whose sum is σ = 26563046400. Its totient is φ = 24266043648.

The previous prime is 25401203249. The next prime is 25401203273. The reversal of 25401203251 is 15230210452.

It is a cyclic number.

It is not a de Polignac number, because 25401203251 - 2¹ = 25401203249 is a prime.

It is a super-2 number, since 2×25401203251² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25401273251) 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, 3794115 + ... + 3800803.

It is an arithmetic number, because the mean of its divisors is an integer number (1660190400).

Almost surely, 2^25401203251 is an apocalyptic number.

25401203251 is a deficient number, since it is larger than the sum of its proper divisors (1161843149).

25401203251 is a wasteful number, since it uses less digits than its factorization.

25401203251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8658.

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 25401203251 in words is "twenty-five billion, four hundred one million, two hundred three thousand, two hundred fifty-one".