66675321 has 36 divisors (see below), whose sum is σ = 104352768. Its totient is φ = 40944288.

The previous prime is 66675317. The next prime is 66675331. The reversal of 66675321 is 12357666.

It is not a de Polignac number, because 66675321 - 2² = 66675317 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66675331) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 173896 + ... + 174278.

It is an arithmetic number, because the mean of its divisors is an integer number (2898688).

Almost surely, 2^66675321 is an apocalyptic number.

It is an amenable number.

66675321 is a deficient number, since it is larger than the sum of its proper divisors (37677447).

66675321 is a wasteful number, since it uses less digits than its factorization.

66675321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470 (or 438 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 66675321 is about 8165.4957595972. The cubic root of 66675321 is about 405.4976780802.

The spelling of 66675321 in words is "sixty-six million, six hundred seventy-five thousand, three hundred twenty-one".