66923713 has 8 divisors (see below), whose sum is σ = 72776232. Its totient is φ = 61284096.

The previous prime is 66923707. The next prime is 66923729. The reversal of 66923713 is 31732966.

It can be written as a sum of positive squares in 4 ways, for example, as 54582544 + 12341169 = 7388^2 + 3513^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66923713 - 2¹⁷ = 66792641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66920713) 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, 52570 + ... + 53827.

It is an arithmetic number, because the mean of its divisors is an integer number (9097029).

Almost surely, 2^66923713 is an apocalyptic number.

It is an amenable number.

66923713 is a deficient number, since it is larger than the sum of its proper divisors (5852519).

66923713 is a wasteful number, since it uses less digits than its factorization.

66923713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106451.

The product of its digits is 40824, while the sum is 37.

The square root of 66923713 is about 8180.6914744415. The cubic root of 66923713 is about 406.0006005961. Note that the first 3 decimals are identical.

The spelling of 66923713 in words is "sixty-six million, nine hundred twenty-three thousand, seven hundred thirteen".