76666663 has 2 divisors, whose sum is σ = 76666664. Its totient is φ = 76666662.

The previous prime is 76666657. The next prime is 76666703. The reversal of 76666663 is 36666667.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 76666663 - 2⁵ = 76666631 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76666643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38333331 + 38333332.

It is an arithmetic number, because the mean of its divisors is an integer number (38333332).

Almost surely, 2^76666663 is an apocalyptic number.

76666663 is a deficient number, since it is larger than the sum of its proper divisors (1).

76666663 is an equidigital number, since it uses as much as digits as its factorization.

76666663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 46.

The square root of 76666663 is about 8755.9501483277. The cubic root of 76666663 is about 424.8172926303.

The spelling of 76666663 in words is "seventy-six million, six hundred sixty-six thousand, six hundred sixty-three".