25489080409 has 9 divisors (see below), whose sum is σ = 27602849469. Its totient is φ = 23526466080.

The previous prime is 25489080391. The next prime is 25489080413. The reversal of 25489080409 is 90408098452.

The square root of 25489080409 is 159653.

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

It can be written as a sum of positive squares in 4 ways, for example, as 25857225 + 25463223184 = 5085^2 + 159572^2 .

It is not a de Polignac number, because 25489080409 - 2⁵ = 25489080377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25489080439) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2069349 + ... + 2081629.

Almost surely, 2^25489080409 is an apocalyptic number.

25489080409 is the 159653-rd square number.

25489080409 is the 79827-th centered octagonal number.

It is an amenable number.

25489080409 is a deficient number, since it is larger than the sum of its proper divisors (2113769060).

25489080409 is an frugal number, since it uses more digits than its factorization.

25489080409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24588 (or 12294 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

Multiplying 25489080409 by its sum of digits (49), we get a square (1248964940041 = 1117571²).

The spelling of 25489080409 in words is "twenty-five billion, four hundred eighty-nine million, eighty thousand, four hundred nine".