217983980378364 has 48 divisors (see below), whose sum is σ = 511574523694080. Its totient is φ = 72241426206720.

The previous prime is 217983980378357. The next prime is 217983980378387. The reversal of 217983980378364 is 463873089389712.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 217983980378364.

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, 50906322 + ... + 55022009.

It is an arithmetic number, because the mean of its divisors is an integer number (10657802576960).

Almost surely, 2^{217983980378364} is an apocalyptic number.

It is an amenable number.

217983980378364 is an abundant number, since it is smaller than the sum of its proper divisors (293590543315716).

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

217983980378364 is a wasteful number, since it uses less digits than its factorization.

217983980378364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105929330 (or 105929328 counting only the distinct ones).

The product of its (nonzero) digits is 2633637888, while the sum is 78.

The spelling of 217983980378364 in words is "two hundred seventeen trillion, nine hundred eighty-three billion, nine hundred eighty million, three hundred seventy-eight thousand, three hundred sixty-four".