66964237 has 4 divisors (see below), whose sum is σ = 68389056. Its totient is φ = 65539420.

The previous prime is 66964231. The next prime is 66964243. The reversal of 66964237 is 73246966.

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 an interprime number because it is at equal distance from previous prime (66964231) and next prime (66964243).

It is a cyclic number.

It is not a de Polignac number, because 66964237 - 2³ = 66964229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66964193 and 66964202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66964231) 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, 712339 + ... + 712432.

It is an arithmetic number, because the mean of its divisors is an integer number (17097264).

Almost surely, 2^66964237 is an apocalyptic number.

It is an amenable number.

66964237 is a deficient number, since it is larger than the sum of its proper divisors (1424819).

66964237 is a wasteful number, since it uses less digits than its factorization.

66964237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424818.

The product of its digits is 326592, while the sum is 43.

The square root of 66964237 is about 8183.1679073572. The cubic root of 66964237 is about 406.0825319368.

The spelling of 66964237 in words is "sixty-six million, nine hundred sixty-four thousand, two hundred thirty-seven".