694639666873 has 4 divisors (see below), whose sum is σ = 731199649360. Its totient is φ = 658079684388.

The previous prime is 694639666837. The next prime is 694639666883. The reversal of 694639666873 is 378666936496.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 694639666873 - 2²⁵ = 694606112441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 694639666796 and 694639666805.

It is not an unprimeable number, because it can be changed into a prime (694639666883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18279991215 + ... + 18279991252.

It is an arithmetic number, because the mean of its divisors is an integer number (182799912340).

Almost surely, 2^694639666873 is an apocalyptic number.

It is an amenable number.

694639666873 is a deficient number, since it is larger than the sum of its proper divisors (36559982487).

694639666873 is a wasteful number, since it uses less digits than its factorization.

694639666873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36559982486.

The product of its digits is 1269789696, while the sum is 73.

The spelling of 694639666873 in words is "six hundred ninety-four billion, six hundred thirty-nine million, six hundred sixty-six thousand, eight hundred seventy-three".