155832256121 has 4 divisors (see below), whose sum is σ = 156192146292. Its totient is φ = 155472365952.

The previous prime is 155832256103. The next prime is 155832256159. The reversal of 155832256121 is 121652238551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121652238551 = 67 ⋅1815705053.

It can be written as a sum of positive squares in 2 ways, for example, as 43480590400 + 112351665721 = 208520^2 + 335189^2 .

It is a cyclic number.

It is not a de Polignac number, because 155832256121 - 2⁶ = 155832256057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155832256171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179944436 + ... + 179945301.

It is an arithmetic number, because the mean of its divisors is an integer number (39048036573).

Almost surely, 2^155832256121 is an apocalyptic number.

It is an amenable number.

155832256121 is a deficient number, since it is larger than the sum of its proper divisors (359890171).

155832256121 is an equidigital number, since it uses as much as digits as its factorization.

155832256121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359890170.

The product of its digits is 144000, while the sum is 41.

The spelling of 155832256121 in words is "one hundred fifty-five billion, eight hundred thirty-two million, two hundred fifty-six thousand, one hundred twenty-one".