155799871915 has 8 divisors (see below), whose sum is σ = 188431971840. Its totient is φ = 123658480512.

The previous prime is 155799871867. The next prime is 155799871919. The reversal of 155799871915 is 519178997551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155799871915 - 2²¹ = 155797774763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155799871919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122676430 + ... + 122677699.

It is an arithmetic number, because the mean of its divisors is an integer number (23553996480).

Almost surely, 2^155799871915 is an apocalyptic number.

155799871915 is a deficient number, since it is larger than the sum of its proper divisors (32632099925).

155799871915 is a wasteful number, since it uses less digits than its factorization.

155799871915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245354261.

The product of its digits is 35721000, while the sum is 67.

The spelling of 155799871915 in words is "one hundred fifty-five billion, seven hundred ninety-nine million, eight hundred seventy-one thousand, nine hundred fifteen".