66734939 has 4 divisors (see below), whose sum is σ = 68538624. Its totient is φ = 64931256.

The previous prime is 66734929. The next prime is 66734963. The reversal of 66734939 is 93943766.

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 66734939 - 2⁸ = 66734683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66734893 and 66734902.

It is not an unprimeable number, because it can be changed into a prime (66734929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 901787 + ... + 901860.

It is an arithmetic number, because the mean of its divisors is an integer number (17134656).

Almost surely, 2^66734939 is an apocalyptic number.

66734939 is a deficient number, since it is larger than the sum of its proper divisors (1803685).

66734939 is a wasteful number, since it uses less digits than its factorization.

66734939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803684.

The product of its digits is 734832, while the sum is 47.

The square root of 66734939 is about 8169.1455489543. The cubic root of 66734939 is about 405.6185011894.

The spelling of 66734939 in words is "sixty-six million, seven hundred thirty-four thousand, nine hundred thirty-nine".