66761216 has 40 divisors (see below), whose sum is σ = 135085104. Its totient is φ = 32957440.

The previous prime is 66761183. The next prime is 66761221. The reversal of 66761216 is 61216766.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41711 + ... + 43281.

Almost surely, 2^66761216 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 66761216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67542552).

66761216 is an abundant number, since it is smaller than the sum of its proper divisors (68323888).

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

66761216 is an equidigital number, since it uses as much as digits as its factorization.

66761216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672 (or 1656 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 66761216 is about 8170.7536984051. The cubic root of 66761216 is about 405.6717318703.

The spelling of 66761216 in words is "sixty-six million, seven hundred sixty-one thousand, two hundred sixteen".