66666733 has 4 divisors (see below), whose sum is σ = 76190560. Its totient is φ = 57142908.

The previous prime is 66666731. The next prime is 66666749. The reversal of 66666733 is 33766666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33766666 = 2 ⋅16883333.

It is a cyclic number.

It is not a de Polignac number, because 66666733 - 2¹ = 66666731 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66666733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4761903 + ... + 4761916.

It is an arithmetic number, because the mean of its divisors is an integer number (19047640).

Almost surely, 2^66666733 is an apocalyptic number.

It is an amenable number.

66666733 is a deficient number, since it is larger than the sum of its proper divisors (9523827).

66666733 is an equidigital number, since it uses as much as digits as its factorization.

66666733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9523826.

The product of its digits is 489888, while the sum is 43.

The square root of 66666733 is about 8164.9698713467. The cubic root of 66666733 is about 405.4802675224.

The spelling of 66666733 in words is "sixty-six million, six hundred sixty-six thousand, seven hundred thirty-three".