66360921 has 16 divisors (see below), whose sum is σ = 96669120. Its totient is φ = 40158720.

The previous prime is 66360913. The next prime is 66360923. The reversal of 66360921 is 12906366.

It is a happy number.

It is not a de Polignac number, because 66360921 - 2³ = 66360913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (66360923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32301 + ... + 34293.

It is an arithmetic number, because the mean of its divisors is an integer number (6041820).

Almost surely, 2^66360921 is an apocalyptic number.

It is an amenable number.

66360921 is a deficient number, since it is larger than the sum of its proper divisors (30308199).

66360921 is a wasteful number, since it uses less digits than its factorization.

66360921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 66360921 is about 8146.2212712398. The cubic root of 66360921 is about 404.8593140372.

The spelling of 66360921 in words is "sixty-six million, three hundred sixty thousand, nine hundred twenty-one".