66312854 has 4 divisors (see below), whose sum is σ = 99469284. Its totient is φ = 33156426.

The previous prime is 66312853. The next prime is 66312859. The reversal of 66312854 is 45821366.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66312853) 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 as a sum of consecutive naturals, namely, 16578212 + ... + 16578215.

It is an arithmetic number, because the mean of its divisors is an integer number (24867321).

Almost surely, 2^66312854 is an apocalyptic number.

66312854 is a deficient number, since it is larger than the sum of its proper divisors (33156430).

66312854 is a wasteful number, since it uses less digits than its factorization.

66312854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33156429.

The product of its digits is 34560, while the sum is 35.

The square root of 66312854 is about 8143.2704732190. The cubic root of 66312854 is about 404.7615402631.

The spelling of 66312854 in words is "sixty-six million, three hundred twelve thousand, eight hundred fifty-four".