67216066 has 4 divisors (see below), whose sum is σ = 100824102. Its totient is φ = 33608032.

The previous prime is 67216057. The next prime is 67216067. The reversal of 67216066 is 66061276.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 66994225 + 221841 = 8185^2 + 471^2 .

It is not an unprimeable number, because it can be changed into a prime (67216067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16804015 + ... + 16804018.

Almost surely, 2^67216066 is an apocalyptic number.

67216066 is a deficient number, since it is larger than the sum of its proper divisors (33608036).

67216066 is a wasteful number, since it uses less digits than its factorization.

67216066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33608035.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 67216066 is about 8198.5404798659. The cubic root of 67216066 is about 406.5909397948.

The spelling of 67216066 in words is "sixty-seven million, two hundred sixteen thousand, sixty-six".