216081011690 has 16 divisors (see below), whose sum is σ = 390172785192. Its totient is φ = 86159745984.

The previous prime is 216081011683. The next prime is 216081011743. The reversal of 216081011690 is 96110180612.

It can be written as a sum of positive squares in 4 ways, for example, as 131498341129 + 84582670561 = 362627^2 + 290831^2 .

It is a super-2 number, since 2×216081011690² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216081011690.

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, 34079009 + ... + 34085348.

Almost surely, 2^216081011690 is an apocalyptic number.

216081011690 is a deficient number, since it is larger than the sum of its proper divisors (174091773502).

216081011690 is a wasteful number, since it uses less digits than its factorization.

216081011690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68164681.

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 216081011690 in words is "two hundred sixteen billion, eighty-one million, eleven thousand, six hundred ninety".