66512887 has 8 divisors (see below), whose sum is σ = 78467072. Its totient is φ = 55171800.

The previous prime is 66512881. The next prime is 66512899. The reversal of 66512887 is 78821566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66512887 - 2⁷ = 66512759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66512881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153039 + ... + 153472.

It is an arithmetic number, because the mean of its divisors is an integer number (9808384).

Almost surely, 2^66512887 is an apocalyptic number.

66512887 is a deficient number, since it is larger than the sum of its proper divisors (11954185).

66512887 is a wasteful number, since it uses less digits than its factorization.

66512887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306549.

The product of its digits is 161280, while the sum is 43.

The square root of 66512887 is about 8155.5433295397. The cubic root of 66512887 is about 405.1681200103.

The spelling of 66512887 in words is "sixty-six million, five hundred twelve thousand, eight hundred eighty-seven".