76666665 has 16 divisors (see below), whose sum is σ = 124747200. Its totient is φ = 40195392.

The previous prime is 76666663. The next prime is 76666703. The reversal of 76666665 is 56666667.

It is not a de Polignac number, because 76666665 - 2¹ = 76666663 is a prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (76666663) 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 in 15 ways as a sum of consecutive naturals, for example, 42430 + ... + 44199.

It is an arithmetic number, because the mean of its divisors is an integer number (7796700).

Almost surely, 2^76666665 is an apocalyptic number.

It is an amenable number.

76666665 is a deficient number, since it is larger than the sum of its proper divisors (48080535).

76666665 is a wasteful number, since it uses less digits than its factorization.

76666665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86696.

The product of its digits is 1632960, while the sum is 48.

The square root of 76666665 is about 8755.9502625358. The cubic root of 76666665 is about 424.8172963244.

The spelling of 76666665 in words is "seventy-six million, six hundred sixty-six thousand, six hundred sixty-five".