216866607774 has 16 divisors (see below), whose sum is σ = 436129533840. Its totient is φ = 71889482880.

The previous prime is 216866607767. The next prime is 216866607809. The reversal of 216866607774 is 477706668612.

It is a happy number.

It is a super-2 number, since 2×216866607774² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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, 99845419 + ... + 99847590.

It is an arithmetic number, because the mean of its divisors is an integer number (27258095865).

Almost surely, 2^216866607774 is an apocalyptic number.

216866607774 is an abundant number, since it is smaller than the sum of its proper divisors (219262926066).

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

216866607774 is a wasteful number, since it uses less digits than its factorization.

216866607774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199693195.

The product of its (nonzero) digits is 28449792, while the sum is 60.

The spelling of 216866607774 in words is "two hundred sixteen billion, eight hundred sixty-six million, six hundred seven thousand, seven hundred seventy-four".