76661213 has 2 divisors, whose sum is σ = 76661214. Its totient is φ = 76661212.

The previous prime is 76661209. The next prime is 76661251. The reversal of 76661213 is 31216667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75655204 + 1006009 = 8698^2 + 1003^2 .

It is a cyclic number.

It is not a de Polignac number, because 76661213 - 2² = 76661209 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76661213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76661203) 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, 38330606 + 38330607.

It is an arithmetic number, because the mean of its divisors is an integer number (38330607).

Almost surely, 2^76661213 is an apocalyptic number.

It is an amenable number.

76661213 is a deficient number, since it is larger than the sum of its proper divisors (1).

76661213 is an equidigital number, since it uses as much as digits as its factorization.

76661213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 76661213 is about 8755.6389258580. The cubic root of 76661213 is about 424.8072260685.

The spelling of 76661213 in words is "seventy-six million, six hundred sixty-one thousand, two hundred thirteen".