216985942278 has 48 divisors (see below), whose sum is σ = 537426479616. Its totient is φ = 61981219440.

The previous prime is 216985942267. The next prime is 216985942291. The reversal of 216985942278 is 872249589612.

216985942278 is a `hidden beast` number, since 2 + 1 + 6 + 98 + 59 + 422 + 78 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 331683 + ... + 737553.

It is an arithmetic number, because the mean of its divisors is an integer number (11196384992).

Almost surely, 2^216985942278 is an apocalyptic number.

216985942278 is an abundant number, since it is smaller than the sum of its proper divisors (320440537338).

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

216985942278 is a wasteful number, since it uses less digits than its factorization.

216985942278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410129 (or 410126 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The spelling of 216985942278 in words is "two hundred sixteen billion, nine hundred eighty-five million, nine hundred forty-two thousand, two hundred seventy-eight".