26431264789 has 2 divisors, whose sum is σ = 26431264790. Its totient is φ = 26431264788.

The previous prime is 26431264723. The next prime is 26431264807. The reversal of 26431264789 is 98746213462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25417924900 + 1013339889 = 159430^2 + 31833^2 .

It is a cyclic number.

It is not a de Polignac number, because 26431264789 - 2¹⁵ = 26431232021 is a prime.

It is a super-2 number, since 2×26431264789² (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 (26431264289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13215632394 + 13215632395.

It is an arithmetic number, because the mean of its divisors is an integer number (13215632395).

Almost surely, 2^26431264789 is an apocalyptic number.

It is an amenable number.

26431264789 is a deficient number, since it is larger than the sum of its proper divisors (1).

26431264789 is an equidigital number, since it uses as much as digits as its factorization.

26431264789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 52.

The spelling of 26431264789 in words is "twenty-six billion, four hundred thirty-one million, two hundred sixty-four thousand, seven hundred eighty-nine".