25513921242 has 40 divisors (see below), whose sum is σ = 58564490292. Its totient is φ = 8297208000.

The previous prime is 25513921231. The next prime is 25513921261. The reversal of 25513921242 is 24212931552.

25513921242 is a `hidden beast` number, since 2 + 5 + 513 + 92 + 12 + 42 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24217273161 + 1296648081 = 155619^2 + 36009^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25513921197 and 25513921206.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1914009 + ... + 1927292.

Almost surely, 2^25513921242 is an apocalyptic number.

25513921242 is an abundant number, since it is smaller than the sum of its proper divisors (33050569050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25513921242 is a wasteful number, since it uses less digits than its factorization.

25513921242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3841356 (or 3841347 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The spelling of 25513921242 in words is "twenty-five billion, five hundred thirteen million, nine hundred twenty-one thousand, two hundred forty-two".