155120440205331 has 12 divisors (see below), whose sum is σ = 224063060097240. Its totient is φ = 103413533562240.

The previous prime is 155120440205287. The next prime is 155120440205371. The reversal of 155120440205331 is 133502044021551.

155120440205331 is a `hidden beast` number, since 1 + 5 + 5 + 1 + 2 + 0 + 440 + 205 + 3 + 3 + 1 = 666.

It is not a de Polignac number, because 155120440205331 - 2¹¹ = 155120440203283 is a prime.

It is a super-2 number, since 2×155120440205331² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155120440205371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3649660 + ... + 17987798.

It is an arithmetic number, because the mean of its divisors is an integer number (18671921674770).

Almost surely, 2^{155120440205331} is an apocalyptic number.

155120440205331 is a deficient number, since it is larger than the sum of its proper divisors (68942619891909).

155120440205331 is a wasteful number, since it uses less digits than its factorization.

155120440205331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15540226 (or 15540223 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

Adding to 155120440205331 its reverse (133502044021551), we get a palindrome (288622484226882).

The spelling of 155120440205331 in words is "one hundred fifty-five trillion, one hundred twenty billion, four hundred forty million, two hundred five thousand, three hundred thirty-one".