216951946377 has 8 divisors (see below), whose sum is σ = 291829167264. Its totient is φ = 143354678208.

The previous prime is 216951946369. The next prime is 216951946381. The reversal of 216951946377 is 773649159612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216951946377 - 2³ = 216951946369 is a prime.

It is a super-2 number, since 2×216951946377² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216951946377.

It is not an unprimeable number, because it can be changed into a prime (216951946327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319987783 + ... + 319988460.

It is an arithmetic number, because the mean of its divisors is an integer number (36478645908).

Almost surely, 2^216951946377 is an apocalyptic number.

It is an amenable number.

216951946377 is a deficient number, since it is larger than the sum of its proper divisors (74877220887).

216951946377 is a wasteful number, since it uses less digits than its factorization.

216951946377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639976359.

The product of its digits is 17146080, while the sum is 60.

The spelling of 216951946377 in words is "two hundred sixteen billion, nine hundred fifty-one million, nine hundred forty-six thousand, three hundred seventy-seven".