155115276121 has 4 divisors (see below), whose sum is σ = 167047220452. Its totient is φ = 143183331792.

The previous prime is 155115276109. The next prime is 155115276131. The reversal of 155115276121 is 121672511551.

155115276121 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: 121672511551 = 829 ⋅146770219.

It can be written as a sum of positive squares in 2 ways, for example, as 104461472025 + 50653804096 = 323205^2 + 225064^2 .

It is a cyclic number.

It is not a de Polignac number, because 155115276121 - 2⁷ = 155115275993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155115276101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5965972146 + ... + 5965972171.

It is an arithmetic number, because the mean of its divisors is an integer number (41761805113).

Almost surely, 2^155115276121 is an apocalyptic number.

It is an amenable number.

155115276121 is a deficient number, since it is larger than the sum of its proper divisors (11931944331).

155115276121 is a wasteful number, since it uses less digits than its factorization.

155115276121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11931944330.

The product of its digits is 21000, while the sum is 37.

Adding to 155115276121 its reverse (121672511551), we get a palindrome (276787787672).

The spelling of 155115276121 in words is "one hundred fifty-five billion, one hundred fifteen million, two hundred seventy-six thousand, one hundred twenty-one".