25642463117 has 4 divisors (see below), whose sum is σ = 25645804896. Its totient is φ = 25639121340.

The previous prime is 25642463069. The next prime is 25642463129. The reversal of 25642463117 is 71136424652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25642463117 - 2³⁰ = 24568721293 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 (25642963117) 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, 1659353 + ... + 1674734.

It is an arithmetic number, because the mean of its divisors is an integer number (6411451224).

Almost surely, 2^25642463117 is an apocalyptic number.

It is an amenable number.

25642463117 is a deficient number, since it is larger than the sum of its proper divisors (3341779).

25642463117 is an equidigital number, since it uses as much as digits as its factorization.

25642463117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3341778.

The product of its digits is 241920, while the sum is 41.

Adding to 25642463117 its reverse (71136424652), we get a palindrome (96778887769).

The spelling of 25642463117 in words is "twenty-five billion, six hundred forty-two million, four hundred sixty-three thousand, one hundred seventeen".