25646495167 has 4 divisors (see below), whose sum is σ = 26066929576. Its totient is φ = 25226060760.

The previous prime is 25646495153. The next prime is 25646495179. The reversal of 25646495167 is 76159464652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25646495167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25646495467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210217113 + ... + 210217234.

It is an arithmetic number, because the mean of its divisors is an integer number (6516732394).

Almost surely, 2^25646495167 is an apocalyptic number.

25646495167 is a deficient number, since it is larger than the sum of its proper divisors (420434409).

25646495167 is an equidigital number, since it uses as much as digits as its factorization.

25646495167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420434408.

The product of its digits is 10886400, while the sum is 55.

The spelling of 25646495167 in words is "twenty-five billion, six hundred forty-six million, four hundred ninety-five thousand, one hundred sixty-seven".