16156263121 has 4 divisors (see below), whose sum is σ = 16158555700. Its totient is φ = 16153970544.

The previous prime is 16156263119. The next prime is 16156263181. The reversal of 16156263121 is 12136265161.

16156263121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12136265161 = 127 ⋅95561143.

It can be written as a sum of positive squares in 2 ways, for example, as 9377210896 + 6779052225 = 96836^2 + 82335^2 .

It is a cyclic number.

It is not a de Polignac number, because 16156263121 - 2¹ = 16156263119 is a prime.

It is a super-2 number, since 2×16156263121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16156263181) 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, 1135686 + ... + 1149823.

It is an arithmetic number, because the mean of its divisors is an integer number (4039638925).

Almost surely, 2^16156263121 is an apocalyptic number.

It is an amenable number.

16156263121 is a deficient number, since it is larger than the sum of its proper divisors (2292579).

16156263121 is an equidigital number, since it uses as much as digits as its factorization.

16156263121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292578.

The product of its digits is 12960, while the sum is 34.

The spelling of 16156263121 in words is "sixteen billion, one hundred fifty-six million, two hundred sixty-three thousand, one hundred twenty-one".