216667881366 has 32 divisors (see below), whose sum is σ = 453679349760. Its totient is φ = 68892040224.

The previous prime is 216667881299. The next prime is 216667881427. The reversal of 216667881366 is 663188766612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7486870 + ... + 7515753.

It is an arithmetic number, because the mean of its divisors is an integer number (14177479680).

Almost surely, 2^216667881366 is an apocalyptic number.

216667881366 is an abundant number, since it is smaller than the sum of its proper divisors (237011468394).

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

216667881366 is a wasteful number, since it uses less digits than its factorization.

216667881366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15002740.

The product of its digits is 20901888, while the sum is 60.

The spelling of 216667881366 in words is "two hundred sixteen billion, six hundred sixty-seven million, eight hundred eighty-one thousand, three hundred sixty-six".