26693742989 has 2 divisors, whose sum is σ = 26693742990. Its totient is φ = 26693742988.

The previous prime is 26693742961. The next prime is 26693742991. The reversal of 26693742989 is 98924739662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24481922089 + 2211820900 = 156467^2 + 47030^2 .

It is a cyclic number.

It is not a de Polignac number, because 26693742989 - 2²⁸ = 26425307533 is a prime.

Together with 26693742991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26693742949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13346871494 + 13346871495.

It is an arithmetic number, because the mean of its divisors is an integer number (13346871495).

Almost surely, 2^26693742989 is an apocalyptic number.

It is an amenable number.

26693742989 is a deficient number, since it is larger than the sum of its proper divisors (1).

26693742989 is an equidigital number, since it uses as much as digits as its factorization.

26693742989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70543872, while the sum is 65.

The spelling of 26693742989 in words is "twenty-six billion, six hundred ninety-three million, seven hundred forty-two thousand, nine hundred eighty-nine".