25171649873 has 2 divisors, whose sum is σ = 25171649874. Its totient is φ = 25171649872.

The previous prime is 25171649861. The next prime is 25171649911. The reversal of 25171649873 is 37894617152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25138736704 + 32913169 = 158552^2 + 5737^2 .

It is a cyclic number.

It is not a de Polignac number, because 25171649873 - 2⁸ = 25171649617 is a prime.

It is a super-2 number, since 2×25171649873² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25171649813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12585824936 + 12585824937.

It is an arithmetic number, because the mean of its divisors is an integer number (12585824937).

Almost surely, 2^25171649873 is an apocalyptic number.

It is an amenable number.

25171649873 is a deficient number, since it is larger than the sum of its proper divisors (1).

25171649873 is an equidigital number, since it uses as much as digits as its factorization.

25171649873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 53.

The spelling of 25171649873 in words is "twenty-five billion, one hundred seventy-one million, six hundred forty-nine thousand, eight hundred seventy-three".