215505555242 has 16 divisors (see below), whose sum is σ = 334383514080. Its totient is φ = 104086286928.

The previous prime is 215505555197. The next prime is 215505555289. The reversal of 215505555242 is 242555505512.

It is a self number, because there is not a number n which added to its sum of digits gives 215505555242.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10465388 + ... + 10485959.

It is an arithmetic number, because the mean of its divisors is an integer number (20898969630).

Almost surely, 2^215505555242 is an apocalyptic number.

215505555242 is a deficient number, since it is larger than the sum of its proper divisors (118877958838).

215505555242 is a wasteful number, since it uses less digits than its factorization.

215505555242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20951525.

The product of its (nonzero) digits is 500000, while the sum is 41.

The spelling of 215505555242 in words is "two hundred fifteen billion, five hundred five million, five hundred fifty-five thousand, two hundred forty-two".