6694938981 has 16 divisors (see below), whose sum is σ = 9955310400. Its totient is φ = 4446695664.

The previous prime is 6694938973. The next prime is 6694939001. The reversal of 6694938981 is 1898394966.

It is a happy number.

6694938981 is a `hidden beast` number, since 6 + 69 + 493 + 8 + 9 + 81 = 666.

It is not a de Polignac number, because 6694938981 - 2³ = 6694938973 is a prime.

It is a super-2 number, since 2×6694938981² = 89644415918626636722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6694938941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453631 + ... + 468156.

It is an arithmetic number, because the mean of its divisors is an integer number (622206900).

Almost surely, 2^6694938981 is an apocalyptic number.

It is an amenable number.

6694938981 is a deficient number, since it is larger than the sum of its proper divisors (3260371419).

6694938981 is a wasteful number, since it uses less digits than its factorization.

6694938981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922065 (or 922059 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The square root of 6694938981 is about 81822.6067844334. The cubic root of 6694938981 is about 1884.7288322765.

The spelling of 6694938981 in words is "six billion, six hundred ninety-four million, nine hundred thirty-eight thousand, nine hundred eighty-one".