66733739 has 4 divisors (see below), whose sum is σ = 66760056. Its totient is φ = 66707424.

The previous prime is 66733703. The next prime is 66733747. The reversal of 66733739 is 93733766.

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

It is a cyclic number.

It is not a de Polignac number, because 66733739 - 2¹² = 66729643 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 66733739.

It is not an unprimeable number, because it can be changed into a prime (66723739) 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, 8894 + ... + 14579.

It is an arithmetic number, because the mean of its divisors is an integer number (16690014).

Almost surely, 2^66733739 is an apocalyptic number.

66733739 is a deficient number, since it is larger than the sum of its proper divisors (26317).

66733739 is a wasteful number, since it uses less digits than its factorization.

66733739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26316.

The product of its digits is 428652, while the sum is 44.

The square root of 66733739 is about 8169.0721015303. The cubic root of 66733739 is about 405.6160699536.

The spelling of 66733739 in words is "sixty-six million, seven hundred thirty-three thousand, seven hundred thirty-nine".