25171649963 has 2 divisors, whose sum is σ = 25171649964. Its totient is φ = 25171649962.

The previous prime is 25171649911. The next prime is 25171649969. The reversal of 25171649963 is 36994617152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25171649963 - 2¹⁰ = 25171648939 is a prime.

It is a super-2 number, since 2×25171649963² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25171649969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12585824981 + 12585824982.

It is an arithmetic number, because the mean of its divisors is an integer number (12585824982).

Almost surely, 2^25171649963 is an apocalyptic number.

25171649963 is a deficient number, since it is larger than the sum of its proper divisors (1).

25171649963 is an equidigital number, since it uses as much as digits as its factorization.

25171649963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 53.

The spelling of 25171649963 in words is "twenty-five billion, one hundred seventy-one million, six hundred forty-nine thousand, nine hundred sixty-three".