1391790667723 has 2 divisors, whose sum is σ = 1391790667724. Its totient is φ = 1391790667722.

The previous prime is 1391790667697. The next prime is 1391790667769. The reversal of 1391790667723 is 3277660971931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1391790667723 - 2²⁵ = 1391757113291 is a prime.

It is not a weakly prime, because it can be changed into another prime (1391790667793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695895333861 + 695895333862.

It is an arithmetic number, because the mean of its divisors is an integer number (695895333862).

Almost surely, 2^{1391790667723} is an apocalyptic number.

1391790667723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391790667723 is an equidigital number, since it uses as much as digits as its factorization.

1391790667723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18003384, while the sum is 61.

The spelling of 1391790667723 in words is "one trillion, three hundred ninety-one billion, seven hundred ninety million, six hundred sixty-seven thousand, seven hundred twenty-three".