25401163633 has 2 divisors, whose sum is σ = 25401163634. Its totient is φ = 25401163632.

The previous prime is 25401163621. The next prime is 25401163639. The reversal of 25401163633 is 33636110452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25034517729 + 366645904 = 158223^2 + 19148^2 .

It is a cyclic number.

It is not a de Polignac number, because 25401163633 - 2⁹ = 25401163121 is a prime.

It is a super-2 number, since 2×25401163633² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25401163639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12700581816 + 12700581817.

It is an arithmetic number, because the mean of its divisors is an integer number (12700581817).

Almost surely, 2^25401163633 is an apocalyptic number.

It is an amenable number.

25401163633 is a deficient number, since it is larger than the sum of its proper divisors (1).

25401163633 is an equidigital number, since it uses as much as digits as its factorization.

25401163633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 34.

The spelling of 25401163633 in words is "twenty-five billion, four hundred one million, one hundred sixty-three thousand, six hundred thirty-three".