76680661 has 2 divisors, whose sum is σ = 76680662. Its totient is φ = 76680660.

The previous prime is 76680649. The next prime is 76680679. The reversal of 76680661 is 16608667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68807025 + 7873636 = 8295^2 + 2806^2 .

It is an emirp because it is prime and its reverse (16608667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76680661 - 2¹⁹ = 76156373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76680061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38340330 + 38340331.

It is an arithmetic number, because the mean of its divisors is an integer number (38340331).

Almost surely, 2^76680661 is an apocalyptic number.

It is an amenable number.

76680661 is a deficient number, since it is larger than the sum of its proper divisors (1).

76680661 is an equidigital number, since it uses as much as digits as its factorization.

76680661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 76680661 is about 8756.7494539926. The cubic root of 76680661 is about 424.8431458080.

The spelling of 76680661 in words is "seventy-six million, six hundred eighty thousand, six hundred sixty-one".