216807786258860 has 24 divisors (see below), whose sum is σ = 455296627718016. Its totient is φ = 86723061822720.

The previous prime is 216807786258851. The next prime is 216807786258871. The reversal of 216807786258860 is 68852687708612.

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, 63742100 + ... + 67057220.

It is an arithmetic number, because the mean of its divisors is an integer number (18970692821584).

Almost surely, 2^{216807786258860} is an apocalyptic number.

216807786258860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216807786258860 is an abundant number, since it is smaller than the sum of its proper divisors (238488841459156).

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

216807786258860 is a wasteful number, since it uses less digits than its factorization.

216807786258860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6585113 (or 6585111 counting only the distinct ones).

The product of its (nonzero) digits is 867041280, while the sum is 74.

The spelling of 216807786258860 in words is "two hundred sixteen trillion, eight hundred seven billion, seven hundred eighty-six million, two hundred fifty-eight thousand, eight hundred sixty".