155011100326321 has 4 divisors (see below), whose sum is σ = 155011167242100. Its totient is φ = 155011033410544.

The previous prime is 155011100326261. The next prime is 155011100326339. The reversal of 155011100326321 is 123623001110551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 153674799006096 + 1336301320225 = 12396564^2 + 1155985^2 .

It is a cyclic number.

It is not a de Polignac number, because 155011100326321 - 2¹¹ = 155011100324273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155011100326361) 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, 29853706 + ... + 34659283.

It is an arithmetic number, because the mean of its divisors is an integer number (38752791810525).

Almost surely, 2^{155011100326321} is an apocalyptic number.

It is an amenable number.

155011100326321 is a deficient number, since it is larger than the sum of its proper divisors (66915779).

155011100326321 is an equidigital number, since it uses as much as digits as its factorization.

155011100326321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66915778.

The product of its (nonzero) digits is 5400, while the sum is 31.

Adding to 155011100326321 its reverse (123623001110551), we get a palindrome (278634101436872).

The spelling of 155011100326321 in words is "one hundred fifty-five trillion, eleven billion, one hundred million, three hundred twenty-six thousand, three hundred twenty-one".