25814993436 has 24 divisors (see below), whose sum is σ = 66927761040. Its totient is φ = 8604997776.

The previous prime is 25814993417. The next prime is 25814993453. The reversal of 25814993436 is 63439941852.

25814993436 is a `hidden beast` number, since 2 + 5 + 81 + 49 + 93 + 436 = 666.

It is a super-2 number, since 2×25814993436² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119513751 + ... + 119513966.

It is an arithmetic number, because the mean of its divisors is an integer number (2788656710).

Almost surely, 2^25814993436 is an apocalyptic number.

It is an amenable number.

25814993436 is an abundant number, since it is smaller than the sum of its proper divisors (41112767604).

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

25814993436 is a wasteful number, since it uses less digits than its factorization.

25814993436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239027730 (or 239027722 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The spelling of 25814993436 in words is "twenty-five billion, eight hundred fourteen million, nine hundred ninety-three thousand, four hundred thirty-six".