6939057055681 has 27 divisors (see below), whose sum is σ = 7272298232227. Its totient is φ = 6620926268960.

The previous prime is 6939057055633. The next prime is 6939057055709. The reversal of 6939057055681 is 1865507509396.

The square root of 6939057055681 is 2634209.

It is a perfect power (a square), and thus also a powerful number.

6939057055681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 334362654081 + 6604694401600 = 578241^2 + 2569960^2 .

It is not a de Polignac number, because 6939057055681 - 2⁹ = 6939057055169 is a prime.

It is a super-2 number, since 2×6939057055681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6939057059681) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5076120060 + ... + 5076121426.

Almost surely, 2^{6939057055681} is an apocalyptic number.

6939057055681 is the 2634209-th square number.

6939057055681 is the 1317105-th centered octagonal number.

It is an amenable number.

6939057055681 is a deficient number, since it is larger than the sum of its proper divisors (333241176546).

6939057055681 is an frugal number, since it uses more digits than its factorization.

6939057055681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2910 (or 1455 counting only the distinct ones).

The product of its (nonzero) digits is 61236000, while the sum is 64.

Multiplying 6939057055681 by its sum of digits (64), we get a square (444099651563584 = 21073672²).

The spelling of 6939057055681 in words is "six trillion, nine hundred thirty-nine billion, fifty-seven million, fifty-five thousand, six hundred eighty-one".