694643981121 has 6 divisors (see below), whose sum is σ = 1003374639410. Its totient is φ = 463095987408.

The previous prime is 694643981093. The next prime is 694643981123. The reversal of 694643981121 is 121189346496.

694643981121 is a `hidden beast` number, since 6 + 9 + 4 + 6 + 439 + 81 + 121 = 666.

It can be written as a sum of positive squares in only one way, i.e., 687134892096 + 7509089025 = 828936^2 + 86655^2 .

It is not a de Polignac number, because 694643981121 - 2⁹ = 694643980609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (694643981123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38591332276 + ... + 38591332293.

Almost surely, 2^694643981121 is an apocalyptic number.

It is an amenable number.

694643981121 is a deficient number, since it is larger than the sum of its proper divisors (308730658289).

694643981121 is a wasteful number, since it uses less digits than its factorization.

694643981121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77182664575 (or 77182664572 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The spelling of 694643981121 in words is "six hundred ninety-four billion, six hundred forty-three million, nine hundred eighty-one thousand, one hundred twenty-one".