25599040009 has 9 divisors (see below), whose sum is σ = 25763442453. Its totient is φ = 25435683072.

The previous prime is 25599039953. The next prime is 25599040021. The reversal of 25599040009 is 90004099552.

It is a happy number.

The square root of 25599040009 is 159997.

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 958831225 + 24640208784 = 30965^2 + 156972^2 .

It is not a de Polignac number, because 25599040009 - 2²⁵ = 25565485577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25599047009) 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, 30879007 + ... + 30879835.

It is an arithmetic number, because the mean of its divisors is an integer number (2862604717).

Almost surely, 2^25599040009 is an apocalyptic number.

25599040009 is the 159997-th square number.

25599040009 is the 79999-th centered octagonal number.

It is an amenable number.

25599040009 is a deficient number, since it is larger than the sum of its proper divisors (164402444).

25599040009 is an frugal number, since it uses more digits than its factorization.

25599040009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044 (or 1022 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 43.

The spelling of 25599040009 in words is "twenty-five billion, five hundred ninety-nine million, forty thousand, nine".