6761977921 has 2 divisors, whose sum is σ = 6761977922. Its totient is φ = 6761977920.

The previous prime is 6761977909. The next prime is 6761977949. The reversal of 6761977921 is 1297791676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5511577600 + 1250400321 = 74240^2 + 35361^2 .

It is a cyclic number.

It is not a de Polignac number, because 6761977921 - 2¹³ = 6761969729 is a prime.

It is not a weakly prime, because it can be changed into another prime (6761977121) 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 as a sum of consecutive naturals, namely, 3380988960 + 3380988961.

It is an arithmetic number, because the mean of its divisors is an integer number (3380988961).

Almost surely, 2^6761977921 is an apocalyptic number.

It is an amenable number.

6761977921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6761977921 is an equidigital number, since it uses as much as digits as its factorization.

6761977921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2000376, while the sum is 55.

The square root of 6761977921 is about 82231.2466219502. The cubic root of 6761977921 is about 1890.9987835158.

The spelling of 6761977921 in words is "six billion, seven hundred sixty-one million, nine hundred seventy-seven thousand, nine hundred twenty-one".