156975221842 has 8 divisors (see below), whose sum is σ = 235846950156. Its totient is φ = 78359571792.

The previous prime is 156975221723. The next prime is 156975221857. The reversal of 156975221842 is 248122579651.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 130161486841 + 26813735001 = 360779^2 + 163749^2 .

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

It is a super-2 number, since 2×156975221842² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 156975221842.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 64018033 + ... + 64020484.

Almost surely, 2^156975221842 is an apocalyptic number.

156975221842 is a deficient number, since it is larger than the sum of its proper divisors (78871728314).

156975221842 is a wasteful number, since it uses less digits than its factorization.

156975221842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128039132.

The product of its digits is 2419200, while the sum is 52.

The spelling of 156975221842 in words is "one hundred fifty-six billion, nine hundred seventy-five million, two hundred twenty-one thousand, eight hundred forty-two".