6938851681 has 4 divisors (see below), whose sum is σ = 6939247252. Its totient is φ = 6938456112.

The previous prime is 6938851651. The next prime is 6938851691. The reversal of 6938851681 is 1861588396.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4316490000 + 2622361681 = 65700^2 + 51209^2 .

It is a cyclic number.

It is not a de Polignac number, because 6938851681 - 2¹⁷ = 6938720609 is a prime.

It is a super-2 number, since 2×6938851681² = 96295325301833051522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6938851651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170190 + ... + 206983.

It is an arithmetic number, because the mean of its divisors is an integer number (1734811813).

Almost surely, 2^6938851681 is an apocalyptic number.

It is an amenable number.

6938851681 is a deficient number, since it is larger than the sum of its proper divisors (395571).

6938851681 is a wasteful number, since it uses less digits than its factorization.

6938851681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395570.

The product of its digits is 2488320, while the sum is 55.

The square root of 6938851681 is about 83299.7699936801. The cubic root of 6938851681 is about 1907.3447640899.

The spelling of 6938851681 in words is "six billion, nine hundred thirty-eight million, eight hundred fifty-one thousand, six hundred eighty-one".