25552979181 has 24 divisors (see below), whose sum is σ = 38112931584. Its totient is φ = 16480414080.

The previous prime is 25552979171. The next prime is 25552979197. The reversal of 25552979181 is 18197925552.

25552979181 is a `hidden beast` number, since 2 + 5 + 552 + 9 + 7 + 9 + 1 + 81 = 666.

It is not a de Polignac number, because 25552979181 - 2¹⁸ = 25552717037 is a prime.

It is a super-2 number, since 2×25552979181² (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 (25552979171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 954085 + ... + 980501.

It is an arithmetic number, because the mean of its divisors is an integer number (1588038816).

Almost surely, 2^25552979181 is an apocalyptic number.

It is an amenable number.

25552979181 is a deficient number, since it is larger than the sum of its proper divisors (12559952403).

25552979181 is a wasteful number, since it uses less digits than its factorization.

25552979181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29921 (or 29918 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 54.

The spelling of 25552979181 in words is "twenty-five billion, five hundred fifty-two million, nine hundred seventy-nine thousand, one hundred eighty-one".