25501940821 has 8 divisors (see below), whose sum is σ = 29185170560. Its totient is φ = 21828734928.

The previous prime is 25501940803. The next prime is 25501940857. The reversal of 25501940821 is 12804910552.

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

It is not a de Polignac number, because 25501940821 - 2¹⁹ = 25501416533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25501940021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2500506 + ... + 2510683.

It is an arithmetic number, because the mean of its divisors is an integer number (3648146320).

Almost surely, 2^25501940821 is an apocalyptic number.

It is an amenable number.

25501940821 is a deficient number, since it is larger than the sum of its proper divisors (3683229739).

25501940821 is an equidigital number, since it uses as much as digits as its factorization.

25501940821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5011923.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 25501940821 in words is "twenty-five billion, five hundred one million, nine hundred forty thousand, eight hundred twenty-one".