77668499 has 2 divisors, whose sum is σ = 77668500. Its totient is φ = 77668498.

The previous prime is 77668471. The next prime is 77668517. The reversal of 77668499 is 99486677.

It is a strong prime.

It is an emirp because it is prime and its reverse (99486677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77668499 - 2¹² = 77664403 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (77668429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38834249 + 38834250.

It is an arithmetic number, because the mean of its divisors is an integer number (38834250).

Almost surely, 2^77668499 is an apocalyptic number.

77668499 is a deficient number, since it is larger than the sum of its proper divisors (1).

77668499 is an equidigital number, since it uses as much as digits as its factorization.

77668499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4572288, while the sum is 56.

The square root of 77668499 is about 8812.9733348059. The cubic root of 77668499 is about 426.6597134962.

The spelling of 77668499 in words is "seventy-seven million, six hundred sixty-eight thousand, four hundred ninety-nine".