25161111231 has 4 divisors (see below), whose sum is σ = 33548148312. Its totient is φ = 16774074152.

The previous prime is 25161111179. The next prime is 25161111233. The reversal of 25161111231 is 13211116152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25161111231 - 2²¹ = 25159014079 is a prime.

It is a super-2 number, since 2×25161111231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25161111233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4193518536 + ... + 4193518541.

It is an arithmetic number, because the mean of its divisors is an integer number (8387037078).

Almost surely, 2^25161111231 is an apocalyptic number.

25161111231 is a deficient number, since it is larger than the sum of its proper divisors (8387037081).

25161111231 is an equidigital number, since it uses as much as digits as its factorization.

25161111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8387037080.

The product of its digits is 360, while the sum is 24.

Adding to 25161111231 its reverse (13211116152), we get a palindrome (38372227383).

The spelling of 25161111231 in words is "twenty-five billion, one hundred sixty-one million, one hundred eleven thousand, two hundred thirty-one".