25542972242 has 6 divisors (see below), whose sum is σ = 38314797399. Its totient is φ = 12771373110.

The previous prime is 25542972241. The next prime is 25542972281. The reversal of 25542972242 is 24227924552.

It can be written as a sum of positive squares in only one way, i.e., 12771486121 + 12771486121 = 113011^2 + 113011^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=113011.

It is a super-3 number, since 3×25542972242³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25542972193 and 25542972202.

It is not an unprimeable number, because it can be changed into a prime (25542972241) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 169517 + ... + 282527.

Almost surely, 2^25542972242 is an apocalyptic number.

25542972242 is a deficient number, since it is larger than the sum of its proper divisors (12771825157).

25542972242 is an frugal number, since it uses more digits than its factorization.

25542972242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226024 (or 113013 counting only the distinct ones).

The product of its digits is 806400, while the sum is 44.

The spelling of 25542972242 in words is "twenty-five billion, five hundred forty-two million, nine hundred seventy-two thousand, two hundred forty-two".