6767776021 has 8 divisors (see below), whose sum is σ = 6837412824. Its totient is φ = 6698496000.

The previous prime is 6767776009. The next prime is 6767776033. The reversal of 6767776021 is 1206777676.

It is an interprime number because it is at equal distance from previous prime (6767776009) and next prime (6767776033).

It can be written as a sum of positive squares in 4 ways, for example, as 3416987025 + 3350788996 = 58455^2 + 57886^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6767776021 - 2⁷ = 6767775893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6767770021) 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, 50980 + ... + 127021.

It is an arithmetic number, because the mean of its divisors is an integer number (854676603).

Almost surely, 2^6767776021 is an apocalyptic number.

It is an amenable number.

6767776021 is a deficient number, since it is larger than the sum of its proper divisors (69636803).

6767776021 is a wasteful number, since it uses less digits than its factorization.

6767776021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178391.

The product of its (nonzero) digits is 1037232, while the sum is 49.

The square root of 6767776021 is about 82266.4939145944. The cubic root of 6767776021 is about 1891.5391119962.

The spelling of 6767776021 in words is "six billion, seven hundred sixty-seven million, seven hundred seventy-six thousand, twenty-one".