25220298481 has 21 divisors (see below), whose sum is σ = 29487333081. Its totient is φ = 21570708852.

The previous prime is 25220298479. The next prime is 25220298487. The reversal of 25220298481 is 18489202252.

The square root of 25220298481 is 158809.

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

It is not a de Polignac number, because 25220298481 - 2¹ = 25220298479 is a prime.

It is a super-2 number, since 2×25220298481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25220298487) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 54471256 + ... + 54471718.

Almost surely, 2^25220298481 is an apocalyptic number.

25220298481 is the 158809-th square number.

25220298481 is the 79405-th centered octagonal number.

It is an amenable number.

25220298481 is a deficient number, since it is larger than the sum of its proper divisors (4267034600).

25220298481 is an frugal number, since it uses more digits than its factorization.

25220298481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 25220298481 in words is "twenty-five billion, two hundred twenty million, two hundred ninety-eight thousand, four hundred eighty-one".