25643830690 has 16 divisors (see below), whose sum is σ = 46607041728. Its totient is φ = 10157944176.

The previous prime is 25643830637. The next prime is 25643830691. The reversal of 25643830690 is 9603834652.

It is a happy number.

It is a super-2 number, since 2×25643830690² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25643830690.

It is not an unprimeable number, because it can be changed into a prime (25643830691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12447432 + ... + 12449491.

It is an arithmetic number, because the mean of its divisors is an integer number (2912940108).

Almost surely, 2^25643830690 is an apocalyptic number.

25643830690 is a deficient number, since it is larger than the sum of its proper divisors (20963211038).

25643830690 is a wasteful number, since it uses less digits than its factorization.

25643830690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24897033.

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 25643830690 in words is "twenty-five billion, six hundred forty-three million, eight hundred thirty thousand, six hundred ninety".