26431264663 has 2 divisors, whose sum is σ = 26431264664. Its totient is φ = 26431264662.

The previous prime is 26431264633. The next prime is 26431264723. The reversal of 26431264663 is 36646213462.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26431264663 - 2⁹ = 26431264151 is a prime.

It is a super-2 number, since 2×26431264663² (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 (26431264633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13215632331 + 13215632332.

It is an arithmetic number, because the mean of its divisors is an integer number (13215632332).

Almost surely, 2^26431264663 is an apocalyptic number.

26431264663 is a deficient number, since it is larger than the sum of its proper divisors (1).

26431264663 is an equidigital number, since it uses as much as digits as its factorization.

26431264663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 43.

The spelling of 26431264663 in words is "twenty-six billion, four hundred thirty-one million, two hundred sixty-four thousand, six hundred sixty-three".