66512236 has 96 divisors (see below), whose sum is σ = 149811200. Its totient is φ = 25194240.

The previous prime is 66512231. The next prime is 66512249. The reversal of 66512236 is 63221566.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 66512198 and 66512207.

It is not an unprimeable number, because it can be changed into a prime (66512231) 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 31 ways as a sum of consecutive naturals, for example, 610150 + ... + 610258.

Almost surely, 2^66512236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66512236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74905600).

66512236 is an abundant number, since it is smaller than the sum of its proper divisors (83298964).

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

66512236 is a wasteful number, since it uses less digits than its factorization.

66512236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 205 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 66512236 is about 8155.5034179381. The cubic root of 66512236 is about 405.1667981346.

66512236 divided by its sum of digits (31) gives a triangular number (2145556 = T₂₀₇₁).

The spelling of 66512236 in words is "sixty-six million, five hundred twelve thousand, two hundred thirty-six".