215775288811 has 4 divisors (see below), whose sum is σ = 215794612192. Its totient is φ = 215755965432.

The previous prime is 215775288809. The next prime is 215775288847. The reversal of 215775288811 is 118882577512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215775288811 - 2¹ = 215775288809 is a prime.

It is a super-2 number, since 2×215775288811² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215775280811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9644931 + ... + 9667276.

It is an arithmetic number, because the mean of its divisors is an integer number (53948653048).

Almost surely, 2^215775288811 is an apocalyptic number.

215775288811 is a deficient number, since it is larger than the sum of its proper divisors (19323381).

215775288811 is a wasteful number, since it uses less digits than its factorization.

215775288811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19323380.

The product of its digits is 2508800, while the sum is 55.

The spelling of 215775288811 in words is "two hundred fifteen billion, seven hundred seventy-five million, two hundred eighty-eight thousand, eight hundred eleven".