215161707055111 has 4 divisors (see below), whose sum is σ = 218192153633424. Its totient is φ = 212131260476800.

The previous prime is 215161707055093. The next prime is 215161707055117. The reversal of 215161707055111 is 111550707161512.

It is a happy number.

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 215161707055111 - 2³⁷ = 215024268101639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215161707055117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515223289050 + ... + 1515223289191.

It is an arithmetic number, because the mean of its divisors is an integer number (54548038408356).

Almost surely, 2^{215161707055111} is an apocalyptic number.

215161707055111 is a deficient number, since it is larger than the sum of its proper divisors (3030446578313).

215161707055111 is an equidigital number, since it uses as much as digits as its factorization.

215161707055111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030446578312.

The product of its (nonzero) digits is 73500, while the sum is 43.

The spelling of 215161707055111 in words is "two hundred fifteen trillion, one hundred sixty-one billion, seven hundred seven million, fifty-five thousand, one hundred eleven".