25579700609 has 4 divisors (see below), whose sum is σ = 25596173316. Its totient is φ = 25563227904.

The previous prime is 25579700519. The next prime is 25579700681. The reversal of 25579700609 is 90600797552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12165428209 + 13414272400 = 110297^2 + 115820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25579700609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25579700689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8234024 + ... + 8237129.

It is an arithmetic number, because the mean of its divisors is an integer number (6399043329).

Almost surely, 2^25579700609 is an apocalyptic number.

It is an amenable number.

25579700609 is a deficient number, since it is larger than the sum of its proper divisors (16472707).

25579700609 is a wasteful number, since it uses less digits than its factorization.

25579700609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16472706.

The product of its (nonzero) digits is 1190700, while the sum is 50.

The spelling of 25579700609 in words is "twenty-five billion, five hundred seventy-nine million, seven hundred thousand, six hundred nine".