215860871943 has 8 divisors (see below), whose sum is σ = 319793884400. Its totient is φ = 143907247944.

The previous prime is 215860871929. The next prime is 215860871981. The reversal of 215860871943 is 349178068512.

215860871943 is a `hidden beast` number, since 2 + 1 + 586 + 0 + 8 + 7 + 19 + 43 = 666.

It is not a de Polignac number, because 215860871943 - 2⁹ = 215860871431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215860871943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215860871983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3997423528 + ... + 3997423581.

It is an arithmetic number, because the mean of its divisors is an integer number (39974235550).

It is a 1-persistent number, because it is pandigital, but 2⋅215860871943 = 431721743886 is not.

Almost surely, 2^215860871943 is an apocalyptic number.

215860871943 is a deficient number, since it is larger than the sum of its proper divisors (103933012457).

215860871943 is an equidigital number, since it uses as much as digits as its factorization.

215860871943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7994847118 (or 7994847112 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 215860871943 in words is "two hundred fifteen billion, eight hundred sixty million, eight hundred seventy-one thousand, nine hundred forty-three".