215555220136 has 32 divisors (see below), whose sum is σ = 409901230080. Its totient is φ = 106248542400.

The previous prime is 215555220061. The next prime is 215555220163. The reversal of 215555220136 is 631022555512.

It is a junction number, because it is equal to n+sod(n) for n = 215555220095 and 215555220104.

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, 9292825 + ... + 9315991.

It is an arithmetic number, because the mean of its divisors is an integer number (12809413440).

Almost surely, 2^215555220136 is an apocalyptic number.

It is an amenable number.

215555220136 is a deficient number, since it is larger than the sum of its proper divisors (194346009944).

215555220136 is a wasteful number, since it uses less digits than its factorization.

215555220136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39625 (or 39621 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 37.

Adding to 215555220136 its reverse (631022555512), we get a palindrome (846577775648).

The spelling of 215555220136 in words is "two hundred fifteen billion, five hundred fifty-five million, two hundred twenty thousand, one hundred thirty-six".