25297113721 has 16 divisors (see below), whose sum is σ = 29232923328. Its totient is φ = 21635161600.

The previous prime is 25297113713. The next prime is 25297113727. The reversal of 25297113721 is 12731179252.

It is a cyclic number.

It is not a de Polignac number, because 25297113721 - 2³ = 25297113713 is a prime.

It is a super-2 number, since 2×25297113721² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25297113727) 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, 419226 + ... + 475756.

It is an arithmetic number, because the mean of its divisors is an integer number (1827057708).

Almost surely, 2^25297113721 is an apocalyptic number.

It is an amenable number.

25297113721 is a deficient number, since it is larger than the sum of its proper divisors (3935809607).

25297113721 is a wasteful number, since it uses less digits than its factorization.

25297113721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58952.

The product of its digits is 52920, while the sum is 40.

The spelling of 25297113721 in words is "twenty-five billion, two hundred ninety-seven million, one hundred thirteen thousand, seven hundred twenty-one".