25610157640 has 32 divisors (see below), whose sum is σ = 57641787000. Its totient is φ = 10240697344.

The previous prime is 25610157593. The next prime is 25610157659. The reversal of 25610157640 is 4675101652.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18457396164 + 7152761476 = 135858^2 + 84574^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25610157640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19926 + ... + 227194.

Almost surely, 2^25610157640 is an apocalyptic number.

25610157640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25610157640 is an abundant number, since it is smaller than the sum of its proper divisors (32031629360).

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

25610157640 is a wasteful number, since it uses less digits than its factorization.

25610157640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210369 (or 210365 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 25610157640 in words is "twenty-five billion, six hundred ten million, one hundred fifty-seven thousand, six hundred forty".