66672237 has 4 divisors (see below), whose sum is σ = 88896320. Its totient is φ = 44448156.

The previous prime is 66672223. The next prime is 66672241. The reversal of 66672237 is 73227666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66672237 - 2⁶ = 66672173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66672195 and 66672204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66672217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11112037 + ... + 11112042.

It is an arithmetic number, because the mean of its divisors is an integer number (22224080).

Almost surely, 2^66672237 is an apocalyptic number.

It is an amenable number.

66672237 is a deficient number, since it is larger than the sum of its proper divisors (22224083).

66672237 is a wasteful number, since it uses less digits than its factorization.

66672237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22224082.

The product of its digits is 127008, while the sum is 39.

The square root of 66672237 is about 8165.3069140113. The cubic root of 66672237 is about 405.4914260212.

The spelling of 66672237 in words is "sixty-six million, six hundred seventy-two thousand, two hundred thirty-seven".