2138718734791 has 2 divisors, whose sum is σ = 2138718734792. Its totient is φ = 2138718734790.

The previous prime is 2138718734759. The next prime is 2138718734797. The reversal of 2138718734791 is 1974378178312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2138718734791 - 2⁵ = 2138718734759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138718734797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069359367395 + 1069359367396.

It is an arithmetic number, because the mean of its divisors is an integer number (1069359367396).

Almost surely, 2^{2138718734791} is an apocalyptic number.

2138718734791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138718734791 is an equidigital number, since it uses as much as digits as its factorization.

2138718734791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14224896, while the sum is 61.

The spelling of 2138718734791 in words is "two trillion, one hundred thirty-eight billion, seven hundred eighteen million, seven hundred thirty-four thousand, seven hundred ninety-one".