6979857781 has 8 divisors (see below), whose sum is σ = 7520250080. Its totient is φ = 6439962672.

The previous prime is 6979857769. The next prime is 6979857821. The reversal of 6979857781 is 1877589796.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6979857781 - 2¹³ = 6979849589 is a prime.

It is a super-2 number, since 2×6979857781² = 97436829285972487922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6979857761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94875 + ... + 151528.

It is an arithmetic number, because the mean of its divisors is an integer number (940031260).

Almost surely, 2^6979857781 is an apocalyptic number.

It is an amenable number.

6979857781 is a deficient number, since it is larger than the sum of its proper divisors (540392299).

6979857781 is a wasteful number, since it uses less digits than its factorization.

6979857781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248595.

The product of its digits is 53343360, while the sum is 67.

The square root of 6979857781 is about 83545.5431546172. The cubic root of 6979857781 is about 1911.0946258755.

The spelling of 6979857781 in words is "six billion, nine hundred seventy-nine million, eight hundred fifty-seven thousand, seven hundred eighty-one".