215866550048 has 54 divisors (see below), whose sum is σ = 444392801307. Its totient is φ = 103211613120.

The previous prime is 215866550023. The next prime is 215866550077. The reversal of 215866550048 is 840055668512.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 107933275024 + 107933275024 = 328532^2 + 328532^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=328532.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215866549978 and 215866550005.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 60448103 + ... + 60451673.

Almost surely, 2^215866550048 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215866550048

215866550048 is an abundant number, since it is smaller than the sum of its proper divisors (228526251259).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215866550048 is an frugal number, since it uses more digits than its factorization.

215866550048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7198 (or 3596 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 50.

Multiplying 215866550048 by its sum of digits (50), we get a square (10793327502400 = 3285320²).

The spelling of 215866550048 in words is "two hundred fifteen billion, eight hundred sixty-six million, five hundred fifty thousand, forty-eight".