66576861 has 24 divisors (see below), whose sum is σ = 104229216. Its totient is φ = 40707360.

The previous prime is 66576833. The next prime is 66576869. The reversal of 66576861 is 16867566.

It is not a de Polignac number, because 66576861 - 2⁷ = 66576733 is a prime.

It is a super-2 number, since 2×66576861² = 8864956841226642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66576869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17326 + ... + 20816.

It is an arithmetic number, because the mean of its divisors is an integer number (4342884).

Almost surely, 2^66576861 is an apocalyptic number.

It is an amenable number.

66576861 is a deficient number, since it is larger than the sum of its proper divisors (37652355).

66576861 is a wasteful number, since it uses less digits than its factorization.

66576861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3673 (or 3670 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 66576861 is about 8159.4645044880. The cubic root of 66576861 is about 405.2979791531.

The spelling of 66576861 in words is "sixty-six million, five hundred seventy-six thousand, eight hundred sixty-one".