25634171240 has 16 divisors (see below), whose sum is σ = 57676885380. Its totient is φ = 10253668480.

The previous prime is 25634171221. The next prime is 25634171267. The reversal of 25634171240 is 4217143652.

It can be written as a sum of positive squares in 2 ways, for example, as 25624966084 + 9205156 = 160078^2 + 3034^2 .

It is a super-2 number, since 2×25634171240² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25634171240.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320427101 + ... + 320427180.

Almost surely, 2^25634171240 is an apocalyptic number.

25634171240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25634171240 is an abundant number, since it is smaller than the sum of its proper divisors (32042714140).

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

25634171240 is a wasteful number, since it uses less digits than its factorization.

25634171240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640854292 (or 640854288 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 25634171240 in words is "twenty-five billion, six hundred thirty-four million, one hundred seventy-one thousand, two hundred forty".