216905503236 has 24 divisors (see below), whose sum is σ = 506880860640. Its totient is φ = 72192117312.

The previous prime is 216905503183. The next prime is 216905503249. The reversal of 216905503236 is 632305509612.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13706401 + ... + 13722216.

It is an arithmetic number, because the mean of its divisors is an integer number (21120035860).

Almost surely, 2^216905503236 is an apocalyptic number.

It is an amenable number.

216905503236 is an abundant number, since it is smaller than the sum of its proper divisors (289975357404).

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

216905503236 is a wasteful number, since it uses less digits than its factorization.

216905503236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27429283 (or 27429281 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 42.

The spelling of 216905503236 in words is "two hundred sixteen billion, nine hundred five million, five hundred three thousand, two hundred thirty-six".