66771099 has 12 divisors (see below), whose sum is σ = 96549336. Its totient is φ = 44466912.

The previous prime is 66771091. The next prime is 66771167. The reversal of 66771099 is 99017766.

It is not a de Polignac number, because 66771099 - 2³ = 66771091 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66771091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6492 + ... + 13254.

It is an arithmetic number, because the mean of its divisors is an integer number (8045778).

Almost surely, 2^66771099 is an apocalyptic number.

66771099 is a deficient number, since it is larger than the sum of its proper divisors (29778237).

66771099 is a wasteful number, since it uses less digits than its factorization.

66771099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7866 (or 7863 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 66771099 is about 8171.3584549939. The cubic root of 66771099 is about 405.6917487611.

It can be divided in two parts, 6677 and 1099, that added together give a 5-th power (7776 = 6⁵).

The spelling of 66771099 in words is "sixty-six million, seven hundred seventy-one thousand, ninety-nine".