26659007993 has 2 divisors, whose sum is σ = 26659007994. Its totient is φ = 26659007992.

The previous prime is 26659007959. The next prime is 26659008001. The reversal of 26659007993 is 39970095662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22595200489 + 4063807504 = 150317^2 + 63748^2 .

It is a cyclic number.

It is not a de Polignac number, because 26659007993 - 2¹² = 26659003897 is a prime.

It is not a weakly prime, because it can be changed into another prime (26659007593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13329503996 + 13329503997.

It is an arithmetic number, because the mean of its divisors is an integer number (13329503997).

Almost surely, 2^26659007993 is an apocalyptic number.

It is an amenable number.

26659007993 is a deficient number, since it is larger than the sum of its proper divisors (1).

26659007993 is an equidigital number, since it uses as much as digits as its factorization.

26659007993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5511240, while the sum is 56.

The spelling of 26659007993 in words is "twenty-six billion, six hundred fifty-nine million, seven thousand, nine hundred ninety-three".