76665766 has 4 divisors (see below), whose sum is σ = 114998652. Its totient is φ = 38332882.

The previous prime is 76665749. The next prime is 76665773. The reversal of 76665766 is 66756667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66756667 = 337 ⋅198091.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 19166440 + ... + 19166443.

It is an arithmetic number, because the mean of its divisors is an integer number (28749663).

Almost surely, 2^76665766 is an apocalyptic number.

76665766 is a deficient number, since it is larger than the sum of its proper divisors (38332886).

76665766 is a wasteful number, since it uses less digits than its factorization.

76665766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38332885.

The product of its digits is 1905120, while the sum is 49.

The square root of 76665766 is about 8755.8989258671. The cubic root of 76665766 is about 424.8156358364.

Subtracting from 76665766 its reverse (66756667), we obtain a palindrome (9909099).

The spelling of 76665766 in words is "seventy-six million, six hundred sixty-five thousand, seven hundred sixty-six".