25495656840 has 96 divisors (see below), whose sum is σ = 87735075480. Its totient is φ = 6398908416.

The previous prime is 25495656817. The next prime is 25495656841. The reversal of 25495656840 is 4865659452.

25495656840 is a `hidden beast` number, since 2 + 549 + 5 + 6 + 56 + 8 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 17549360676 + 7946296164 = 132474^2 + 89142^2 .

It is not an unprimeable number, because it can be changed into a prime (25495656841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2076859 + ... + 2089098.

Almost surely, 2^25495656840 is an apocalyptic number.

25495656840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25495656840 is an abundant number, since it is smaller than the sum of its proper divisors (62239418640).

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

25495656840 is a wasteful number, since it uses less digits than its factorization.

25495656840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4165991 (or 4165984 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 54.

The spelling of 25495656840 in words is "twenty-five billion, four hundred ninety-five million, six hundred fifty-six thousand, eight hundred forty".