66899893 has 8 divisors (see below), whose sum is σ = 73483200. Its totient is φ = 60622848.

The previous prime is 66899887. The next prime is 66899933. The reversal of 66899893 is 39899866.

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

It is a de Polignac number, because none of the positive numbers 2^k-66899893 is a prime.

It is a super-2 number, since 2×66899893² = 8951191366822898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66899813) 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 7 ways as a sum of consecutive naturals, for example, 76108 + ... + 76981.

It is an arithmetic number, because the mean of its divisors is an integer number (9185400).

Almost surely, 2^66899893 is an apocalyptic number.

It is an amenable number.

66899893 is a deficient number, since it is larger than the sum of its proper divisors (6583307).

66899893 is a wasteful number, since it uses less digits than its factorization.

66899893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153131.

The product of its digits is 5038848, while the sum is 58.

The square root of 66899893 is about 8179.2354777204. The cubic root of 66899893 is about 405.9524259333.

The spelling of 66899893 in words is "sixty-six million, eight hundred ninety-nine thousand, eight hundred ninety-three".