25440406163 has 4 divisors (see below), whose sum is σ = 25568247600. Its totient is φ = 25312564728.

The previous prime is 25440406141. The next prime is 25440406181. The reversal of 25440406163 is 36160404452.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25440406163 - 2¹² = 25440402067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25440406133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63920420 + ... + 63920817.

It is an arithmetic number, because the mean of its divisors is an integer number (6392061900).

Almost surely, 2^25440406163 is an apocalyptic number.

25440406163 is a deficient number, since it is larger than the sum of its proper divisors (127841437).

25440406163 is a wasteful number, since it uses less digits than its factorization.

25440406163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127841436.

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 25440406163 in words is "twenty-five billion, four hundred forty million, four hundred six thousand, one hundred sixty-three".