216806135873386 has 16 divisors (see below), whose sum is σ = 342337909917600. Its totient is φ = 102693913641648.

The previous prime is 216806135873363. The next prime is 216806135873543. The reversal of 216806135873386 is 683378531608612.

It is a super-2 number, since 2×216806135873386² (a number of 29 digits) contains 22 as substring.

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, 102541605 + ... + 104634568.

It is an arithmetic number, because the mean of its divisors is an integer number (21396119369850).

Almost surely, 2^{216806135873386} is an apocalyptic number.

216806135873386 is a deficient number, since it is larger than the sum of its proper divisors (125531774044214).

216806135873386 is a wasteful number, since it uses less digits than its factorization.

216806135873386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207203733.

The product of its (nonzero) digits is 209018880, while the sum is 67.

The spelling of 216806135873386 in words is "two hundred sixteen trillion, eight hundred six billion, one hundred thirty-five million, eight hundred seventy-three thousand, three hundred eighty-six".