66577066 has 16 divisors (see below), whose sum is σ = 105891840. Its totient is φ = 31285440.

The previous prime is 66577031. The next prime is 66577067. The reversal of 66577066 is 66077566.

It is not an unprimeable number, because it can be changed into a prime (66577067) 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 7 ways as a sum of consecutive naturals, for example, 42721 + ... + 44251.

It is an arithmetic number, because the mean of its divisors is an integer number (6618240).

Almost surely, 2^66577066 is an apocalyptic number.

66577066 is a deficient number, since it is larger than the sum of its proper divisors (39314774).

66577066 is a wasteful number, since it uses less digits than its factorization.

66577066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2829.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 66577066 is about 8159.4770665772. The cubic root of 66577066 is about 405.2983951435.

Subtracting from 66577066 its reverse (66077566), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 66577066 in words is "sixty-six million, five hundred seventy-seven thousand, sixty-six".