25021000634 has 24 divisors (see below), whose sum is σ = 43723697940. Its totient is φ = 10707418176.

The previous prime is 25021000619. The next prime is 25021000681. The reversal of 25021000634 is 43600012052.

It can be written as a sum of positive squares in 2 ways, for example, as 19336293025 + 5684707609 = 139055^2 + 75397^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122219 + ... + 254910.

Almost surely, 2^25021000634 is an apocalyptic number.

25021000634 is a deficient number, since it is larger than the sum of its proper divisors (18702697306).

25021000634 is a wasteful number, since it uses less digits than its factorization.

25021000634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377822 (or 377815 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 25021000634 its reverse (43600012052), we get a palindrome (68621012686).

The spelling of 25021000634 in words is "twenty-five billion, twenty-one million, six hundred thirty-four", and thus it is an aban number.