215816795745 has 16 divisors (see below), whose sum is σ = 345322414080. Its totient is φ = 115097110784.

The previous prime is 215816795731. The next prime is 215816795783. The reversal of 215816795745 is 547597618512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 215816795745 - 2⁷ = 215816795617 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33337 + ... + 657833.

It is an arithmetic number, because the mean of its divisors is an integer number (21582650880).

Almost surely, 2^215816795745 is an apocalyptic number.

It is an amenable number.

215816795745 is a deficient number, since it is larger than the sum of its proper divisors (129505618335).

215816795745 is a wasteful number, since it uses less digits than its factorization.

215816795745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647544.

The product of its digits is 21168000, while the sum is 60.

The spelling of 215816795745 in words is "two hundred fifteen billion, eight hundred sixteen million, seven hundred ninety-five thousand, seven hundred forty-five".