66136216 has 16 divisors (see below), whose sum is σ = 125753040. Its totient is φ = 32602080.

The previous prime is 66136181. The next prime is 66136219. The reversal of 66136216 is 61263166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66136219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57651 + ... + 58786.

It is an arithmetic number, because the mean of its divisors is an integer number (7859565).

Almost surely, 2^66136216 is an apocalyptic number.

It is an amenable number.

66136216 is a deficient number, since it is larger than the sum of its proper divisors (59616824).

66136216 is a wasteful number, since it uses less digits than its factorization.

66136216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116514 (or 116510 counting only the distinct ones).

The product of its digits is 7776, while the sum is 31.

The square root of 66136216 is about 8132.4175987218. The cubic root of 66136216 is about 404.4018319992.

The spelling of 66136216 in words is "sixty-six million, one hundred thirty-six thousand, two hundred sixteen".