66356939 has 8 divisors (see below), whose sum is σ = 72624432. Its totient is φ = 60128640.

The previous prime is 66356929. The next prime is 66356951. The reversal of 66356939 is 93965366.

It is a happy number.

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-66356939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66356893 and 66356902.

It is not an unprimeable number, because it can be changed into a prime (66356929) 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, 6194 + ... + 13079.

It is an arithmetic number, because the mean of its divisors is an integer number (9078054).

Almost surely, 2^66356939 is an apocalyptic number.

66356939 is a deficient number, since it is larger than the sum of its proper divisors (6267493).

66356939 is a wasteful number, since it uses less digits than its factorization.

66356939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19597.

The product of its digits is 787320, while the sum is 47.

The square root of 66356939 is about 8145.9768597756. The cubic root of 66356939 is about 404.8512159879.

The spelling of 66356939 in words is "sixty-six million, three hundred fifty-six thousand, nine hundred thirty-nine".