66416663 has 8 divisors (see below), whose sum is σ = 71540736. Its totient is φ = 61479000.

The previous prime is 66416659. The next prime is 66416677. The reversal of 66416663 is 36661466.

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

It is not a de Polignac number, because 66416663 - 2² = 66416659 is a prime.

It is a super-2 number, since 2×66416663² = 8822346248111138, 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 (66416633) 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, 45863 + ... + 47288.

It is an arithmetic number, because the mean of its divisors is an integer number (8942592).

Almost surely, 2^66416663 is an apocalyptic number.

66416663 is a deficient number, since it is larger than the sum of its proper divisors (5124073).

66416663 is a wasteful number, since it uses less digits than its factorization.

66416663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93205.

The product of its digits is 93312, while the sum is 38.

The square root of 66416663 is about 8149.6418939730. The cubic root of 66416663 is about 404.9726405335.

The spelling of 66416663 in words is "sixty-six million, four hundred sixteen thousand, six hundred sixty-three".