6745974921 has 40 divisors (see below), whose sum is σ = 11529739584. Its totient is φ = 3850558560.

The previous prime is 6745974913. The next prime is 6745974967. The reversal of 6745974921 is 1294795476.

6745974921 is a `hidden beast` number, since 6 + 7 + 4 + 597 + 49 + 2 + 1 = 666.

It is not a de Polignac number, because 6745974921 - 2³ = 6745974913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6745974121) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 544431 + ... + 556683.

Almost surely, 2^6745974921 is an apocalyptic number.

It is an amenable number.

6745974921 is a deficient number, since it is larger than the sum of its proper divisors (4783764663).

6745974921 is a wasteful number, since it uses less digits than its factorization.

6745974921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13243 (or 13234 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 54.

The square root of 6745974921 is about 82133.8841222062. The cubic root of 6745974921 is about 1889.5058496491.

The spelling of 6745974921 in words is "six billion, seven hundred forty-five million, nine hundred seventy-four thousand, nine hundred twenty-one".