25262205440 has 80 divisors (see below), whose sum is σ = 63758106720. Its totient is φ = 9573027840.

The previous prime is 25262205439. The next prime is 25262205467. The reversal of 25262205440 is 4450226252.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 25262205397 and 25262205406.

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, 211046 + ... + 308325.

It is an arithmetic number, because the mean of its divisors is an integer number (796976334).

Almost surely, 2^25262205440 is an apocalyptic number.

25262205440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25262205440 is an abundant number, since it is smaller than the sum of its proper divisors (38495901280).

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

25262205440 is an equidigital number, since it uses as much as digits as its factorization.

25262205440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519413 (or 519397 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

The spelling of 25262205440 in words is "twenty-five billion, two hundred sixty-two million, two hundred five thousand, four hundred forty".