26642453609 has 2 divisors, whose sum is σ = 26642453610. Its totient is φ = 26642453608.

The previous prime is 26642453471. The next prime is 26642453623. The reversal of 26642453609 is 90635424662.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25559056384 + 1083397225 = 159872^2 + 32915^2 .

It is a cyclic number.

It is not a de Polignac number, because 26642453609 - 2²⁰ = 26641405033 is a prime.

It is not a weakly prime, because it can be changed into another prime (26642453309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13321226804 + 13321226805.

It is an arithmetic number, because the mean of its divisors is an integer number (13321226805).

Almost surely, 2^26642453609 is an apocalyptic number.

It is an amenable number.

26642453609 is a deficient number, since it is larger than the sum of its proper divisors (1).

26642453609 is an equidigital number, since it uses as much as digits as its factorization.

26642453609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 47.

The spelling of 26642453609 in words is "twenty-six billion, six hundred forty-two million, four hundred fifty-three thousand, six hundred nine".