25613540642 has 8 divisors (see below), whose sum is σ = 38481200832. Its totient is φ = 12786473700.

The previous prime is 25613540639. The next prime is 25613540651. The reversal of 25613540642 is 24604531652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 25613540596 and 25613540605.

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, 10146734 + ... + 10149257.

It is an arithmetic number, because the mean of its divisors is an integer number (4810150104).

Almost surely, 2^25613540642 is an apocalyptic number.

25613540642 is a deficient number, since it is larger than the sum of its proper divisors (12867660190).

25613540642 is a wasteful number, since it uses less digits than its factorization.

25613540642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20296624.

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 25613540642 in words is "twenty-five billion, six hundred thirteen million, five hundred forty thousand, six hundred forty-two".