2691623639759 has 2 divisors, whose sum is σ = 2691623639760. Its totient is φ = 2691623639758.

The previous prime is 2691623639723. The next prime is 2691623639813. The reversal of 2691623639759 is 9579363261962.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2691623639759 - 2²⁰ = 2691622591183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2691623639059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345811819879 + 1345811819880.

It is an arithmetic number, because the mean of its divisors is an integer number (1345811819880).

Almost surely, 2^{2691623639759} is an apocalyptic number.

2691623639759 is a deficient number, since it is larger than the sum of its proper divisors (1).

2691623639759 is an equidigital number, since it uses as much as digits as its factorization.

2691623639759 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198404640, while the sum is 68.

The spelling of 2691623639759 in words is "two trillion, six hundred ninety-one billion, six hundred twenty-three million, six hundred thirty-nine thousand, seven hundred fifty-nine".