691734017023 has 4 divisors (see below), whose sum is σ = 790553162320. Its totient is φ = 592914871728.

The previous prime is 691734017011. The next prime is 691734017027. The reversal of 691734017023 is 320710437196.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 691734017023 - 2⁵ = 691734016991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691734017027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49409572638 + ... + 49409572651.

It is an arithmetic number, because the mean of its divisors is an integer number (197638290580).

Almost surely, 2^691734017023 is an apocalyptic number.

691734017023 is a deficient number, since it is larger than the sum of its proper divisors (98819145297).

691734017023 is an equidigital number, since it uses as much as digits as its factorization.

691734017023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98819145296.

The product of its (nonzero) digits is 190512, while the sum is 43.

The spelling of 691734017023 in words is "six hundred ninety-one billion, seven hundred thirty-four million, seventeen thousand, twenty-three".