215571588081 has 4 divisors (see below), whose sum is σ = 287428784112. Its totient is φ = 143714392052.

The previous prime is 215571588049. The next prime is 215571588091. The reversal of 215571588081 is 180885175512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215571588081 - 2⁵ = 215571588049 is a prime.

It is a super-2 number, since 2×215571588081² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215571588091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35928598011 + ... + 35928598016.

It is an arithmetic number, because the mean of its divisors is an integer number (71857196028).

Almost surely, 2^215571588081 is an apocalyptic number.

It is an amenable number.

215571588081 is a deficient number, since it is larger than the sum of its proper divisors (71857196031).

215571588081 is an equidigital number, since it uses as much as digits as its factorization.

215571588081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71857196030.

The product of its (nonzero) digits is 896000, while the sum is 51.

The spelling of 215571588081 in words is "two hundred fifteen billion, five hundred seventy-one million, five hundred eighty-eight thousand, eighty-one".