6977889691 has 2 divisors, whose sum is σ = 6977889692. Its totient is φ = 6977889690.

The previous prime is 6977889673. The next prime is 6977889731. The reversal of 6977889691 is 1969887796.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6977889691 - 2⁷ = 6977889563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6977889691.

It is not a weakly prime, because it can be changed into another prime (6977889791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3488944845 + 3488944846.

It is an arithmetic number, because the mean of its divisors is an integer number (3488944846).

Almost surely, 2^6977889691 is an apocalyptic number.

6977889691 is a deficient number, since it is larger than the sum of its proper divisors (1).

6977889691 is an equidigital number, since it uses as much as digits as its factorization.

6977889691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82301184, while the sum is 70.

The square root of 6977889691 is about 83533.7637784866. The cubic root of 6977889691 is about 1910.9149870773.

The spelling of 6977889691 in words is "six billion, nine hundred seventy-seven million, eight hundred eighty-nine thousand, six hundred ninety-one".