766764421 has 2 divisors, whose sum is σ = 766764422. Its totient is φ = 766764420.

The previous prime is 766764391. The next prime is 766764443. The reversal of 766764421 is 124467667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 676780225 + 89984196 = 26015^2 + 9486^2 .

It is a cyclic number.

It is not a de Polignac number, because 766764421 - 2⁹ = 766763909 is a prime.

It is a super-2 number, since 2×766764421² = 1175855354622930482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766764451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383382210 + 383382211.

It is an arithmetic number, because the mean of its divisors is an integer number (383382211).

Almost surely, 2^766764421 is an apocalyptic number.

It is an amenable number.

766764421 is a deficient number, since it is larger than the sum of its proper divisors (1).

766764421 is an equidigital number, since it uses as much as digits as its factorization.

766764421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 43.

The square root of 766764421 is about 27690.5113892828. The cubic root of 766764421 is about 915.2800245781.

The spelling of 766764421 in words is "seven hundred sixty-six million, seven hundred sixty-four thousand, four hundred twenty-one".