216720181376 has 32 divisors (see below), whose sum is σ = 431861145600. Its totient is φ = 108331501824.

The previous prime is 216720181373. The next prime is 216720181411. The reversal of 216720181376 is 673181027612.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (216720181373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267905 + ... + 710783.

It is an arithmetic number, because the mean of its divisors is an integer number (13495660800).

Almost surely, 2^216720181376 is an apocalyptic number.

It is an amenable number.

216720181376 is a deficient number, since it is larger than the sum of its proper divisors (215140964224).

216720181376 is an equidigital number, since it uses as much as digits as its factorization.

216720181376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446716 (or 446704 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 216720181376 in words is "two hundred sixteen billion, seven hundred twenty million, one hundred eighty-one thousand, three hundred seventy-six".