66672169 has 8 divisors (see below), whose sum is σ = 67883040. Its totient is φ = 65467776.

The previous prime is 66672167. The next prime is 66672173. The reversal of 66672169 is 96127666.

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 66672169 - 2¹ = 66672167 is a prime.

It is a super-2 number, since 2×66672169² = 8890356238329122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66672163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22242 + ... + 25060.

It is an arithmetic number, because the mean of its divisors is an integer number (8485380).

Almost surely, 2^66672169 is an apocalyptic number.

It is an amenable number.

66672169 is a deficient number, since it is larger than the sum of its proper divisors (1210871).

66672169 is a wasteful number, since it uses less digits than its factorization.

66672169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239.

The product of its digits is 163296, while the sum is 43.

The square root of 66672169 is about 8165.3027500516. The cubic root of 66672169 is about 405.4912881656.

It can be divided in two parts, 6667 and 2169, that added together give a square (8836 = 94²).

The spelling of 66672169 in words is "sixty-six million, six hundred seventy-two thousand, one hundred sixty-nine".