25163857921 has 8 divisors (see below), whose sum is σ = 25581023424. Its totient is φ = 24746842320.

The previous prime is 25163857919. The next prime is 25163857967. The reversal of 25163857921 is 12975836152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25163857921 - 2¹ = 25163857919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25163857991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330756 + ... + 399658.

It is an arithmetic number, because the mean of its divisors is an integer number (3197627928).

Almost surely, 2^25163857921 is an apocalyptic number.

It is an amenable number.

25163857921 is a deficient number, since it is larger than the sum of its proper divisors (417165503).

25163857921 is an equidigital number, since it uses as much as digits as its factorization.

25163857921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74951.

The product of its digits is 907200, while the sum is 49.

The spelling of 25163857921 in words is "twenty-five billion, one hundred sixty-three million, eight hundred fifty-seven thousand, nine hundred twenty-one".