25670651540 has 12 divisors (see below), whose sum is σ = 53908368276. Its totient is φ = 10268260608.

The previous prime is 25670651521. The next prime is 25670651557. The reversal of 25670651540 is 4515607652.

It can be written as a sum of positive squares in 2 ways, for example, as 6312938116 + 19357713424 = 79454^2 + 139132^2 .

It is a congruent number.

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, 641766269 + ... + 641766308.

It is an arithmetic number, because the mean of its divisors is an integer number (4492364023).

Almost surely, 2^25670651540 is an apocalyptic number.

25670651540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25670651540 is an abundant number, since it is smaller than the sum of its proper divisors (28237716736).

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

25670651540 is a wasteful number, since it uses less digits than its factorization.

25670651540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283532586 (or 1283532584 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 25670651540 in words is "twenty-five billion, six hundred seventy million, six hundred fifty-one thousand, five hundred forty".