25638284663 has 2 divisors, whose sum is σ = 25638284664. Its totient is φ = 25638284662.

The previous prime is 25638284641. The next prime is 25638284677. The reversal of 25638284663 is 36648283652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25638284663 - 2¹⁰ = 25638283639 is a prime.

It is a super-2 number, since 2×25638284663² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25638284263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12819142331 + 12819142332.

It is an arithmetic number, because the mean of its divisors is an integer number (12819142332).

Almost surely, 2^25638284663 is an apocalyptic number.

25638284663 is a deficient number, since it is larger than the sum of its proper divisors (1).

25638284663 is an equidigital number, since it uses as much as digits as its factorization.

25638284663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9953280, while the sum is 53.

The spelling of 25638284663 in words is "twenty-five billion, six hundred thirty-eight million, two hundred eighty-four thousand, six hundred sixty-three".