25440016540 has 24 divisors (see below), whose sum is σ = 53431281792. Its totient is φ = 10174626240.

The previous prime is 25440016531. The next prime is 25440016543. The reversal of 25440016540 is 4561004452.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25440016543) 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, 71925 + ... + 236755.

It is an arithmetic number, because the mean of its divisors is an integer number (2226303408).

Almost surely, 2^25440016540 is an apocalyptic number.

25440016540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25440016540 is an abundant number, since it is smaller than the sum of its proper divisors (27991265252).

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

25440016540 is a wasteful number, since it uses less digits than its factorization.

25440016540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172557 (or 172555 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The spelling of 25440016540 in words is "twenty-five billion, four hundred forty million, sixteen thousand, five hundred forty".