76659221 has 2 divisors, whose sum is σ = 76659222. Its totient is φ = 76659220.

The previous prime is 76659211. The next prime is 76659223. The reversal of 76659221 is 12295667.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76562500 + 96721 = 8750^2 + 311^2 .

It is an emirp because it is prime and its reverse (12295667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76659221 - 2¹⁴ = 76642837 is a prime.

It is a Sophie Germain prime.

Together with 76659223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76659223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38329610 + 38329611.

It is an arithmetic number, because the mean of its divisors is an integer number (38329611).

Almost surely, 2^76659221 is an apocalyptic number.

It is an amenable number.

76659221 is a deficient number, since it is larger than the sum of its proper divisors (1).

76659221 is an equidigital number, since it uses as much as digits as its factorization.

76659221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 76659221 is about 8755.5251698570. The cubic root of 76659221 is about 424.8035465749.

The spelling of 76659221 in words is "seventy-six million, six hundred fifty-nine thousand, two hundred twenty-one".