25925646440 has 32 divisors (see below), whose sum is σ = 59755457160. Its totient is φ = 10117324800.

The previous prime is 25925646419. The next prime is 25925646443. The reversal of 25925646440 is 4464652952.

It can be written as a sum of positive squares in 4 ways, for example, as 7254610276 + 18671036164 = 85174^2 + 136642^2 .

It is not an unprimeable number, because it can be changed into a prime (25925646443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7902521 + ... + 7905800.

Almost surely, 2^25925646440 is an apocalyptic number.

25925646440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25925646440 is an abundant number, since it is smaller than the sum of its proper divisors (33829810720).

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

25925646440 is a wasteful number, since it uses less digits than its factorization.

25925646440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15808373 (or 15808369 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 25925646440 in words is "twenty-five billion, nine hundred twenty-five million, six hundred forty-six thousand, four hundred forty".