25713023561 has 4 divisors (see below), whose sum is σ = 25740005652. Its totient is φ = 25686041472.

The previous prime is 25713023521. The next prime is 25713023579. The reversal of 25713023561 is 16532031752.

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 4939278400 + 20773745161 = 70280^2 + 144131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25713023561 is a prime.

It is a super-2 number, since 2×25713023561² (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 (25713023521) 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, 13489616 + ... + 13491521.

It is an arithmetic number, because the mean of its divisors is an integer number (6435001413).

Almost surely, 2^25713023561 is an apocalyptic number.

It is an amenable number.

25713023561 is a deficient number, since it is larger than the sum of its proper divisors (26982091).

25713023561 is an equidigital number, since it uses as much as digits as its factorization.

25713023561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26982090.

The product of its (nonzero) digits is 37800, while the sum is 35.

The spelling of 25713023561 in words is "twenty-five billion, seven hundred thirteen million, twenty-three thousand, five hundred sixty-one".