25646002045631 has 16 divisors (see below), whose sum is σ = 29475496803840. Its totient is φ = 22068309150720.

The previous prime is 25646002045549. The next prime is 25646002045667. The reversal of 25646002045631 is 13654020064652.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25646002045631 - 2⁴² = 21247955534527 is a prime.

It is a super-2 number, since 2×25646002045631² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25646002045691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52971575 + ... + 53453528.

It is an arithmetic number, because the mean of its divisors is an integer number (1842218550240).

Almost surely, 2^{25646002045631} is an apocalyptic number.

25646002045631 is a deficient number, since it is larger than the sum of its proper divisors (3829494758209).

25646002045631 is a wasteful number, since it uses less digits than its factorization.

25646002045631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106426286.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 25646002045631 in words is "twenty-five trillion, six hundred forty-six billion, two million, forty-five thousand, six hundred thirty-one".