216954978567 has 8 divisors (see below), whose sum is σ = 289348986624. Its totient is φ = 144598811448.

The previous prime is 216954978557. The next prime is 216954978623. The reversal of 216954978567 is 765879459612.

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

It is not a de Polignac number, because 216954978567 - 2⁷ = 216954978439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216954978557) 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, 9446853 + ... + 9469790.

It is an arithmetic number, because the mean of its divisors is an integer number (36168623328).

Almost surely, 2^216954978567 is an apocalyptic number.

216954978567 is a deficient number, since it is larger than the sum of its proper divisors (72394008057).

216954978567 is a wasteful number, since it uses less digits than its factorization.

216954978567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18920469.

The product of its digits is 228614400, while the sum is 69.

The spelling of 216954978567 in words is "two hundred sixteen billion, nine hundred fifty-four million, nine hundred seventy-eight thousand, five hundred sixty-seven".