694639666872 has 24 divisors (see below), whose sum is σ = 1881315764640. Its totient is φ = 231546555600.

The previous prime is 694639666837. The next prime is 694639666883. The reversal of 694639666872 is 278666936496.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (72), and also a Moran number because the ratio is a prime number: 9647773151 = 694639666872 / (6 + 9 + 4 + 6 + 3 + 9 + 6 + 6 + 6 + 8 + 7 + 2).

It is a self number, because there is not a number n which added to its sum of digits gives 694639666872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4823886504 + ... + 4823886647.

It is an arithmetic number, because the mean of its divisors is an integer number (78388156860).

Almost surely, 2^694639666872 is an apocalyptic number.

It is an amenable number.

694639666872 is an abundant number, since it is smaller than the sum of its proper divisors (1186676097768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

694639666872 is a wasteful number, since it uses less digits than its factorization.

694639666872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9647773163 (or 9647773156 counting only the distinct ones).

The product of its digits is 846526464, while the sum is 72.

The spelling of 694639666872 in words is "six hundred ninety-four billion, six hundred thirty-nine million, six hundred sixty-six thousand, eight hundred seventy-two".