215006013581 has 16 divisors (see below), whose sum is σ = 225762700800. Its totient is φ = 204757203024.

The previous prime is 215006013569. The next prime is 215006013619. The reversal of 215006013581 is 185310600512.

215006013581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215006013581 - 2⁶ = 215006013517 is a prime.

It is a super-2 number, since 2×215006013581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215006013281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2747660 + ... + 2824826.

It is an arithmetic number, because the mean of its divisors is an integer number (14110168800).

Almost surely, 2^215006013581 is an apocalyptic number.

It is an amenable number.

215006013581 is a deficient number, since it is larger than the sum of its proper divisors (10756687219).

215006013581 is an frugal number, since it uses more digits than its factorization.

215006013581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77465 (or 77419 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The spelling of 215006013581 in words is "two hundred fifteen billion, six million, thirteen thousand, five hundred eighty-one".