215231556560 has 40 divisors (see below), whose sum is σ = 512618580936. Its totient is φ = 83992801280.

The previous prime is 215231556539. The next prime is 215231556571. The reversal of 215231556560 is 65655132512.

215231556560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 12324552256 + 202907004304 = 111016^2 + 450452^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32806409 + ... + 32812968.

Almost surely, 2^215231556560 is an apocalyptic number.

215231556560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215231556560 is an abundant number, since it is smaller than the sum of its proper divisors (297387024376).

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

215231556560 is a wasteful number, since it uses less digits than its factorization.

215231556560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65619431 (or 65619425 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 41.

The spelling of 215231556560 in words is "two hundred fifteen billion, two hundred thirty-one million, five hundred fifty-six thousand, five hundred sixty".