6766122421 has 2 divisors, whose sum is σ = 6766122422. Its totient is φ = 6766122420.

The previous prime is 6766122361. The next prime is 6766122469. The reversal of 6766122421 is 1242216676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6514265521 + 251856900 = 80711^2 + 15870^2 .

It is a cyclic number.

It is not a de Polignac number, because 6766122421 - 2²¹ = 6764025269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6766126421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3383061210 + 3383061211.

It is an arithmetic number, because the mean of its divisors is an integer number (3383061211).

Almost surely, 2^6766122421 is an apocalyptic number.

It is an amenable number.

6766122421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6766122421 is an equidigital number, since it uses as much as digits as its factorization.

6766122421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 37.

The square root of 6766122421 is about 82256.4430363969. The cubic root of 6766122421 is about 1891.3850434688.

The spelling of 6766122421 in words is "six billion, seven hundred sixty-six million, one hundred twenty-two thousand, four hundred twenty-one".