216665802 has 24 divisors (see below), whose sum is σ = 478302084. Its totient is φ = 70858944.

The previous prime is 216665707. The next prime is 216665807. The reversal of 216665802 is 208566612.

216665802 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 208831401 + 7834401 = 14451^2 + 2799^2 .

It is not an unprimeable number, because it can be changed into a prime (216665807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112603 + ... + 114510.

Almost surely, 2^216665802 is an apocalyptic number.

216665802 is an abundant number, since it is smaller than the sum of its proper divisors (261636282).

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

216665802 is a wasteful number, since it uses less digits than its factorization.

216665802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227174 (or 227171 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 216665802 is about 14719.5720725842. The cubic root of 216665802 is about 600.6158509963.

The spelling of 216665802 in words is "two hundred sixteen million, six hundred sixty-five thousand, eight hundred two".