156336540121 has 4 divisors (see below), whose sum is σ = 156707886244. Its totient is φ = 155965194000.

The previous prime is 156336540119. The next prime is 156336540163. The reversal of 156336540121 is 121045633651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121045633651 = 23 ⋅5262853637.

It can be written as a sum of positive squares in 2 ways, for example, as 55136205721 + 101200334400 = 234811^2 + 318120^2 .

It is a cyclic number.

It is not a de Polignac number, because 156336540121 - 2¹ = 156336540119 is a prime.

It is a super-2 number, since 2×156336540121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156339540121) 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 3 ways as a sum of consecutive naturals, for example, 185672430 + ... + 185673271.

It is an arithmetic number, because the mean of its divisors is an integer number (39176971561).

Almost surely, 2^156336540121 is an apocalyptic number.

It is an amenable number.

156336540121 is a deficient number, since it is larger than the sum of its proper divisors (371346123).

156336540121 is an equidigital number, since it uses as much as digits as its factorization.

156336540121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371346122.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 156336540121 in words is "one hundred fifty-six billion, three hundred thirty-six million, five hundred forty thousand, one hundred twenty-one".