66872369 has 4 divisors (see below), whose sum is σ = 66906996. Its totient is φ = 66837744.

The previous prime is 66872359. The next prime is 66872371. The reversal of 66872369 is 96327866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12334144 + 54538225 = 3512^2 + 7385^2 .

It is a cyclic number.

It is not a de Polignac number, because 66872369 - 2¹⁶ = 66806833 is a prime.

It is a super-2 number, since 2×66872369² = 8943827471344322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66872329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14234 + ... + 18339.

It is an arithmetic number, because the mean of its divisors is an integer number (16726749).

Almost surely, 2^66872369 is an apocalyptic number.

It is an amenable number.

66872369 is a deficient number, since it is larger than the sum of its proper divisors (34627).

66872369 is a wasteful number, since it uses less digits than its factorization.

66872369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34626.

The product of its digits is 653184, while the sum is 47.

The square root of 66872369 is about 8177.5527512820. The cubic root of 66872369 is about 405.8967458878.

It can be divided in two parts, 668 and 72369, that added together give a palindrome (73037).

The spelling of 66872369 in words is "sixty-six million, eight hundred seventy-two thousand, three hundred sixty-nine".