216694669026 has 64 divisors (see below), whose sum is σ = 479119288320. Its totient is φ = 64786962240.

The previous prime is 216694668991. The next prime is 216694669069. The reversal of 216694669026 is 620966496612.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7561641 + ... + 7590243.

It is an arithmetic number, because the mean of its divisors is an integer number (7486238880).

Almost surely, 2^216694669026 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216694669026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239559644160).

216694669026 is an abundant number, since it is smaller than the sum of its proper divisors (262424619294).

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

216694669026 is a wasteful number, since it uses less digits than its factorization.

216694669026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30151.

The product of its (nonzero) digits is 10077696, while the sum is 57.

The spelling of 216694669026 in words is "two hundred sixteen billion, six hundred ninety-four million, six hundred sixty-nine thousand, twenty-six".