25205817380 has 48 divisors (see below), whose sum is σ = 57103386480. Its totient is φ = 9310199808.

The previous prime is 25205817367. The next prime is 25205817391. The reversal of 25205817380 is 8371850252.

It can be written as a sum of positive squares in 8 ways, for example, as 1410903844 + 23794913536 = 37562^2 + 154256^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681365 + ... + 717404.

It is an arithmetic number, because the mean of its divisors is an integer number (1189653885).

Almost surely, 2^25205817380 is an apocalyptic number.

25205817380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25205817380 is an abundant number, since it is smaller than the sum of its proper divisors (31897569100).

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

25205817380 is a wasteful number, since it uses less digits than its factorization.

25205817380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398848 (or 1398846 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 41.

The spelling of 25205817380 in words is "twenty-five billion, two hundred five million, eight hundred seventeen thousand, three hundred eighty".