76666817 has 2 divisors, whose sum is σ = 76666818. Its totient is φ = 76666816.

The previous prime is 76666739. The next prime is 76666829. The reversal of 76666817 is 71866667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52940176 + 23726641 = 7276^2 + 4871^2 .

It is a cyclic number.

It is not a de Polignac number, because 76666817 - 2¹⁸ = 76404673 is a prime.

It is a super-2 number, since 2×76666817² = 11755601657822978, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76666417) 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, 38333408 + 38333409.

It is an arithmetic number, because the mean of its divisors is an integer number (38333409).

Almost surely, 2^76666817 is an apocalyptic number.

It is an amenable number.

76666817 is a deficient number, since it is larger than the sum of its proper divisors (1).

76666817 is an equidigital number, since it uses as much as digits as its factorization.

76666817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The square root of 76666817 is about 8755.9589423432. The cubic root of 76666817 is about 424.8175770731.

The spelling of 76666817 in words is "seventy-six million, six hundred sixty-six thousand, eight hundred seventeen".