215215460181 has 12 divisors (see below), whose sum is σ = 310871147808. Its totient is φ = 143474955624.

The previous prime is 215215460171. The next prime is 215215460203. The reversal of 215215460181 is 181064512512.

215215460181 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 15 + 460 + 181 = 666.

It is not a de Polignac number, because 215215460181 - 2¹⁰ = 215215459157 is a prime.

It is a super-2 number, since 2×215215460181² (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 (215215460171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 801826 + ... + 1036028.

It is an arithmetic number, because the mean of its divisors is an integer number (25905928984).

Almost surely, 2^215215460181 is an apocalyptic number.

It is an amenable number.

215215460181 is a deficient number, since it is larger than the sum of its proper divisors (95655687627).

215215460181 is a wasteful number, since it uses less digits than its factorization.

215215460181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336312 (or 336309 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

Adding to 215215460181 its reverse (181064512512), we get a palindrome (396279972693).

The spelling of 215215460181 in words is "two hundred fifteen billion, two hundred fifteen million, four hundred sixty thousand, one hundred eighty-one".