25471996997 has 4 divisors (see below), whose sum is σ = 25473371616. Its totient is φ = 25470622380.

The previous prime is 25471996943. The next prime is 25471997011. The reversal of 25471996997 is 79969917452.

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 25471996997 - 2²² = 25467802693 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 (25471096997) 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, 659129 + ... + 696702.

It is an arithmetic number, because the mean of its divisors is an integer number (6368342904).

Almost surely, 2^25471996997 is an apocalyptic number.

It is an amenable number.

25471996997 is a deficient number, since it is larger than the sum of its proper divisors (1374619).

25471996997 is a wasteful number, since it uses less digits than its factorization.

25471996997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374618.

The product of its digits is 77157360, while the sum is 68.

The spelling of 25471996997 in words is "twenty-five billion, four hundred seventy-one million, nine hundred ninety-six thousand, nine hundred ninety-seven".