215442261505 has 16 divisors (see below), whose sum is σ = 278775100800. Its totient is φ = 159300051840.

The previous prime is 215442261491. The next prime is 215442261509. The reversal of 215442261505 is 505162244512.

It is a de Polignac number, because none of the positive numbers 2^k-215442261505 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215442261509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27652365 + ... + 27660154.

It is an arithmetic number, because the mean of its divisors is an integer number (17423443800).

Almost surely, 2^215442261505 is an apocalyptic number.

It is an amenable number.

215442261505 is a deficient number, since it is larger than the sum of its proper divisors (63332839295).

215442261505 is a wasteful number, since it uses less digits than its factorization.

215442261505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55312584.

The product of its (nonzero) digits is 96000, while the sum is 37.

The spelling of 215442261505 in words is "two hundred fifteen billion, four hundred forty-two million, two hundred sixty-one thousand, five hundred five".