26661153791 has 2 divisors, whose sum is σ = 26661153792. Its totient is φ = 26661153790.

The previous prime is 26661153787. The next prime is 26661153797. The reversal of 26661153791 is 19735116662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26661153791 - 2² = 26661153787 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26661153797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13330576895 + 13330576896.

It is an arithmetic number, because the mean of its divisors is an integer number (13330576896).

Almost surely, 2^26661153791 is an apocalyptic number.

26661153791 is a deficient number, since it is larger than the sum of its proper divisors (1).

26661153791 is an equidigital number, since it uses as much as digits as its factorization.

26661153791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 47.

The spelling of 26661153791 in words is "twenty-six billion, six hundred sixty-one million, one hundred fifty-three thousand, seven hundred ninety-one".