691493035858 has 8 divisors (see below), whose sum is σ = 1045406794752. Its totient is φ = 343024104276.

The previous prime is 691493035819. The next prime is 691493035907. The reversal of 691493035858 is 858530394196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×691493035858² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 691493035796 and 691493035805.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1361206510 + ... + 1361207017.

It is an arithmetic number, because the mean of its divisors is an integer number (130675849344).

Almost surely, 2^691493035858 is an apocalyptic number.

691493035858 is a deficient number, since it is larger than the sum of its proper divisors (353913758894).

691493035858 is a wasteful number, since it uses less digits than its factorization.

691493035858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2722413656.

The product of its (nonzero) digits is 27993600, while the sum is 61.

The spelling of 691493035858 in words is "six hundred ninety-one billion, four hundred ninety-three million, thirty-five thousand, eight hundred fifty-eight".