66169321 has 16 divisors (see below), whose sum is σ = 73526400. Its totient is φ = 59228928.

The previous prime is 66169309. The next prime is 66169333. The reversal of 66169321 is 12396166.

It is an interprime number because it is at equal distance from previous prime (66169309) and next prime (66169333).

It is a cyclic number.

It is not a de Polignac number, because 66169321 - 2¹³ = 66161129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66169391) 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, 89170 + ... + 89908.

It is an arithmetic number, because the mean of its divisors is an integer number (4595400).

Almost surely, 2^66169321 is an apocalyptic number.

It is an amenable number.

66169321 is a deficient number, since it is larger than the sum of its proper divisors (7357079).

66169321 is a wasteful number, since it uses less digits than its factorization.

66169321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008.

The product of its digits is 11664, while the sum is 34.

The square root of 66169321 is about 8134.4527166860. The cubic root of 66169321 is about 404.4692962435.

The spelling of 66169321 in words is "sixty-six million, one hundred sixty-nine thousand, three hundred twenty-one".