6906804993 has 18 divisors (see below), whose sum is σ = 10965902402. Its totient is φ = 4185941760.

The previous prime is 6906804979. The next prime is 6906805001. The reversal of 6906804993 is 3994086096.

It is a happy number.

6906804993 is a `hidden beast` number, since 6 + 90 + 68 + 0 + 499 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4115479104 + 2791325889 = 64152^2 + 52833^2 .

It is not a de Polignac number, because 6906804993 - 2¹³ = 6906796801 is a prime.

It is a super-2 number, since 2×6906804993² = 95407910422659460098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6906804913) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3170080 + ... + 3172257.

Almost surely, 2^6906804993 is an apocalyptic number.

It is an amenable number.

6906804993 is a deficient number, since it is larger than the sum of its proper divisors (4059097409).

6906804993 is a wasteful number, since it uses less digits than its factorization.

6906804993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6342365 (or 6342351 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 6906804993 is about 83107.1897792243. The cubic root of 6906804993 is about 1904.4039112937.

The spelling of 6906804993 in words is "six billion, nine hundred six million, eight hundred four thousand, nine hundred ninety-three".