216203416864666 has 16 divisors (see below), whose sum is σ = 404328467903040. Its totient is φ = 84235097479680.

The previous prime is 216203416864621. The next prime is 216203416864697. The reversal of 216203416864666 is 666468614302612.

It is a happy number.

216203416864666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 701959145511 + ... + 701959145818.

It is an arithmetic number, because the mean of its divisors is an integer number (25270529243940).

Almost surely, 2^{216203416864666} is an apocalyptic number.

216203416864666 is a deficient number, since it is larger than the sum of its proper divisors (188125051038374).

216203416864666 is a wasteful number, since it uses less digits than its factorization.

216203416864666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403918291349.

The product of its (nonzero) digits is 71663616, while the sum is 61.

The spelling of 216203416864666 in words is "two hundred sixteen trillion, two hundred three billion, four hundred sixteen million, eight hundred sixty-four thousand, six hundred sixty-six".