25405352440 has 32 divisors (see below), whose sum is σ = 61559124480. Its totient is φ = 9380437632.

The previous prime is 25405352303. The next prime is 25405352459. The reversal of 25405352440 is 4425350452.

It is a super-2 number, since 2×25405352440² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25405352396 and 25405352405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24427704 + ... + 24428743.

It is an arithmetic number, because the mean of its divisors is an integer number (1923722640).

Almost surely, 2^25405352440 is an apocalyptic number.

25405352440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25405352440 is an abundant number, since it is smaller than the sum of its proper divisors (36153772040).

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

25405352440 is a wasteful number, since it uses less digits than its factorization.

25405352440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48856471 (or 48856467 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 34.

The spelling of 25405352440 in words is "twenty-five billion, four hundred five million, three hundred fifty-two thousand, four hundred forty".