66956238 has 12 divisors (see below), whose sum is σ = 145071888. Its totient is φ = 22318740.

The previous prime is 66956237. The next prime is 66956291. The reversal of 66956238 is 83265966.

It is a happy number.

It is a super-2 number, since 2×66956238² = 8966275614225288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66956193 and 66956202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66956237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1859878 + ... + 1859913.

It is an arithmetic number, because the mean of its divisors is an integer number (12089324).

Almost surely, 2^66956238 is an apocalyptic number.

66956238 is an abundant number, since it is smaller than the sum of its proper divisors (78115650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66956238 is a wasteful number, since it uses less digits than its factorization.

66956238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3719799 (or 3719796 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 66956238 is about 8182.6791456100. The cubic root of 66956238 is about 406.0663621938.

The spelling of 66956238 in words is "sixty-six million, nine hundred fifty-six thousand, two hundred thirty-eight".