66924921 has 8 divisors (see below), whose sum is σ = 101980864. Its totient is φ = 38242800.

The previous prime is 66924919. The next prime is 66924941. The reversal of 66924921 is 12942966.

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

It is not a de Polignac number, because 66924921 - 2¹ = 66924919 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 66924921.

It is not an unprimeable number, because it can be changed into a prime (66924901) 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, 1593430 + ... + 1593471.

It is an arithmetic number, because the mean of its divisors is an integer number (12747608).

Almost surely, 2^66924921 is an apocalyptic number.

It is an amenable number.

66924921 is a deficient number, since it is larger than the sum of its proper divisors (35055943).

66924921 is a wasteful number, since it uses less digits than its factorization.

66924921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3186911.

The product of its digits is 46656, while the sum is 39.

The square root of 66924921 is about 8180.7653064979. The cubic root of 66924921 is about 406.0030434062.

The spelling of 66924921 in words is "sixty-six million, nine hundred twenty-four thousand, nine hundred twenty-one".