66213236 has 6 divisors (see below), whose sum is σ = 115873170. Its totient is φ = 33106616.

The previous prime is 66213211. The next prime is 66213247. The reversal of 66213236 is 63231266.

It can be written as a sum of positive squares in only one way, i.e., 46321636 + 19891600 = 6806^2 + 4460^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66213199 and 66213208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8276651 + ... + 8276658.

It is an arithmetic number, because the mean of its divisors is an integer number (19312195).

Almost surely, 2^66213236 is an apocalyptic number.

It is an amenable number.

66213236 is a deficient number, since it is larger than the sum of its proper divisors (49659934).

66213236 is a wasteful number, since it uses less digits than its factorization.

66213236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16553313 (or 16553311 counting only the distinct ones).

The product of its digits is 7776, while the sum is 29.

The square root of 66213236 is about 8137.1515900836. The cubic root of 66213236 is about 404.5587553304.

The spelling of 66213236 in words is "sixty-six million, two hundred thirteen thousand, two hundred thirty-six".