25355123442 has 64 divisors (see below), whose sum is σ = 61485909120. Its totient is φ = 7681003200.

The previous prime is 25355123413. The next prime is 25355123461. The reversal of 25355123442 is 24432155352.

25355123442 is a `hidden beast` number, since 2 + 535 + 51 + 2 + 34 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 25355123397 and 25355123406.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3454008 + ... + 3461340.

It is an arithmetic number, because the mean of its divisors is an integer number (960717330).

Almost surely, 2^25355123442 is an apocalyptic number.

25355123442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

25355123442 is an abundant number, since it is smaller than the sum of its proper divisors (36130785678).

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

25355123442 is a wasteful number, since it uses less digits than its factorization.

25355123442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13176 (or 13170 counting only the distinct ones).

The product of its digits is 144000, while the sum is 36.

Adding to 25355123442 its reverse (24432155352), we get a palindrome (49787278794).

The spelling of 25355123442 in words is "twenty-five billion, three hundred fifty-five million, one hundred twenty-three thousand, four hundred forty-two".