216979438374 has 24 divisors (see below), whose sum is σ = 470130766560. Its totient is φ = 72325148688.

The previous prime is 216979438369. The next prime is 216979438381. The reversal of 216979438374 is 473834979612.

216979438374 is a `hidden beast` number, since 2 + 1 + 69 + 79 + 438 + 3 + 74 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1651764 + ... + 1778280.

It is an arithmetic number, because the mean of its divisors is an integer number (19588781940).

Almost surely, 2^216979438374 is an apocalyptic number.

216979438374 is an abundant number, since it is smaller than the sum of its proper divisors (253151328186).

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

216979438374 is a wasteful number, since it uses less digits than its factorization.

216979438374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221804 (or 221801 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 63.

The spelling of 216979438374 in words is "two hundred sixteen billion, nine hundred seventy-nine million, four hundred thirty-eight thousand, three hundred seventy-four".