26798899957 has 2 divisors, whose sum is σ = 26798899958. Its totient is φ = 26798899956.

The previous prime is 26798899951. The next prime is 26798899997. The reversal of 26798899957 is 75999889762.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22026715396 + 4772184561 = 148414^2 + 69081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26798899957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26798899951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13399449978 + 13399449979.

It is an arithmetic number, because the mean of its divisors is an integer number (13399449979).

Almost surely, 2^26798899957 is an apocalyptic number.

It is an amenable number.

26798899957 is a deficient number, since it is larger than the sum of its proper divisors (1).

26798899957 is an equidigital number, since it uses as much as digits as its factorization.

26798899957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1234517760, while the sum is 79.

The spelling of 26798899957 in words is "twenty-six billion, seven hundred ninety-eight million, eight hundred ninety-nine thousand, nine hundred fifty-seven".