66923851 has 8 divisors (see below), whose sum is σ = 69466320. Its totient is φ = 64397088.

The previous prime is 66923827. The next prime is 66923869. The reversal of 66923851 is 15832966.

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 66923851 - 2¹³ = 66915659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66923881) 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 7 ways as a sum of consecutive naturals, for example, 5145 + ... + 12661.

It is an arithmetic number, because the mean of its divisors is an integer number (8683290).

Almost surely, 2^66923851 is an apocalyptic number.

66923851 is a deficient number, since it is larger than the sum of its proper divisors (2542469).

66923851 is a wasteful number, since it uses less digits than its factorization.

66923851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7853.

The product of its digits is 77760, while the sum is 40.

The square root of 66923851 is about 8180.6999089320. The cubic root of 66923851 is about 406.0008796603. Note that the first 3 decimals are identical.

The spelling of 66923851 in words is "sixty-six million, nine hundred twenty-three thousand, eight hundred fifty-one".