215505561042 has 20 divisors (see below), whose sum is σ = 482892090846. Its totient is φ = 71835186960.

The previous prime is 215505561001. The next prime is 215505561059. The reversal of 215505561042 is 240165505512.

215505561042 is a `hidden beast` number, since 2 + 1 + 5 + 50 + 5 + 561 + 0 + 42 = 666.

It can be written as a sum of positive squares in only one way, i.e., 211913836281 + 3591724761 = 460341^2 + 59931^2 .

It is a junction number, because it is equal to n+sod(n) for n = 215505560988 and 215505561006.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 665140459 + ... + 665140782.

Almost surely, 2^215505561042 is an apocalyptic number.

215505561042 is an abundant number, since it is smaller than the sum of its proper divisors (267386529804).

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

215505561042 is a wasteful number, since it uses less digits than its factorization.

215505561042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330281255 (or 1330281246 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The spelling of 215505561042 in words is "two hundred fifteen billion, five hundred five million, five hundred sixty-one thousand, forty-two".