25400271621 has 4 divisors (see below), whose sum is σ = 33867028832. Its totient is φ = 16933514412.

The previous prime is 25400271541. The next prime is 25400271623. The reversal of 25400271621 is 12617200452.

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 not a de Polignac number, because 25400271621 - 2¹³ = 25400263429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25400271623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4233378601 + ... + 4233378606.

It is an arithmetic number, because the mean of its divisors is an integer number (8466757208).

Almost surely, 2^25400271621 is an apocalyptic number.

It is an amenable number.

25400271621 is a deficient number, since it is larger than the sum of its proper divisors (8466757211).

25400271621 is an equidigital number, since it uses as much as digits as its factorization.

25400271621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8466757210.

The product of its (nonzero) digits is 6720, while the sum is 30.

The spelling of 25400271621 in words is "twenty-five billion, four hundred million, two hundred seventy-one thousand, six hundred twenty-one".