76166809 has 2 divisors, whose sum is σ = 76166810. Its totient is φ = 76166808.

The previous prime is 76166767. The next prime is 76166821. The reversal of 76166809 is 90866167.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73616400 + 2550409 = 8580^2 + 1597^2 .

It is a cyclic number.

It is not a de Polignac number, because 76166809 - 2¹¹ = 76164761 is a prime.

It is not a weakly prime, because it can be changed into another prime (76166879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38083404 + 38083405.

It is an arithmetic number, because the mean of its divisors is an integer number (38083405).

Almost surely, 2^76166809 is an apocalyptic number.

It is an amenable number.

76166809 is a deficient number, since it is larger than the sum of its proper divisors (1).

76166809 is an equidigital number, since it uses as much as digits as its factorization.

76166809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 76166809 is about 8727.3597954937. The cubic root of 76166809 is about 423.8920326288.

The spelling of 76166809 in words is "seventy-six million, one hundred sixty-six thousand, eight hundred nine".