76766561 has 4 divisors (see below), whose sum is σ = 77088000. Its totient is φ = 76445124.

The previous prime is 76766551. The next prime is 76766579. The reversal of 76766561 is 16566767.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 76766561 - 2⁶ = 76766497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76766531) 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 3 ways as a sum of consecutive naturals, for example, 160361 + ... + 160838.

It is an arithmetic number, because the mean of its divisors is an integer number (19272000).

Almost surely, 2^76766561 is an apocalyptic number.

It is an amenable number.

76766561 is a deficient number, since it is larger than the sum of its proper divisors (321439).

76766561 is a wasteful number, since it uses less digits than its factorization.

76766561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321438.

The product of its digits is 317520, while the sum is 44.

The square root of 76766561 is about 8761.6528691794. The cubic root of 76766561 is about 425.0017273286.

The spelling of 76766561 in words is "seventy-six million, seven hundred sixty-six thousand, five hundred sixty-one".