25721423641 has 27 divisors (see below), whose sum is σ = 28455564501. Its totient is φ = 23244690744.

The previous prime is 25721423627. The next prime is 25721423669. The reversal of 25721423641 is 14632412752.

The square root of 25721423641 is 160379.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 25721423641 - 2⁹ = 25721423129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25721423641.

It is not an unprimeable number, because it can be changed into a prime (25721423671) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 70085440 + ... + 70085806.

Almost surely, 2^25721423641 is an apocalyptic number.

25721423641 is the 160379-th square number.

25721423641 is the 80190-th centered octagonal number.

It is an amenable number.

25721423641 is a deficient number, since it is larger than the sum of its proper divisors (2734140860).

25721423641 is an frugal number, since it uses more digits than its factorization.

25721423641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818 (or 409 counting only the distinct ones).

The product of its digits is 80640, while the sum is 37.

The spelling of 25721423641 in words is "twenty-five billion, seven hundred twenty-one million, four hundred twenty-three thousand, six hundred forty-one".