215438694111 has 16 divisors (see below), whose sum is σ = 323013841920. Its totient is φ = 141895363320.

The previous prime is 215438694109. The next prime is 215438694143. The reversal of 215438694111 is 111496834512.

215438694111 is a `hidden beast` number, since 2 + 1 + 543 + 8 + 6 + 94 + 1 + 11 = 666.

It is not a de Polignac number, because 215438694111 - 2¹ = 215438694109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215438694011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48065295 + ... + 48069776.

It is an arithmetic number, because the mean of its divisors is an integer number (20188365120).

Almost surely, 2^215438694111 is an apocalyptic number.

215438694111 is a deficient number, since it is larger than the sum of its proper divisors (107575147809).

215438694111 is an equidigital number, since it uses as much as digits as its factorization.

215438694111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96135163 (or 96135157 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The spelling of 215438694111 in words is "two hundred fifteen billion, four hundred thirty-eight million, six hundred ninety-four thousand, one hundred eleven".