155513033254331 has 4 divisors (see below), whose sum is σ = 155513117186472. Its totient is φ = 155512949322192.

The previous prime is 155513033254309. The next prime is 155513033254361. The reversal of 155513033254331 is 133452330315551.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155513033254331 is a prime.

It is a super-2 number, since 2×155513033254331² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155513033254361) 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, 39122585 + ... + 42913898.

It is an arithmetic number, because the mean of its divisors is an integer number (38878279296618).

Almost surely, 2^{155513033254331} is an apocalyptic number.

155513033254331 is a deficient number, since it is larger than the sum of its proper divisors (83932141).

155513033254331 is an equidigital number, since it uses as much as digits as its factorization.

155513033254331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83932140.

The product of its (nonzero) digits is 1215000, while the sum is 44.

Adding to 155513033254331 its reverse (133452330315551), we get a palindrome (288965363569882).

The spelling of 155513033254331 in words is "one hundred fifty-five trillion, five hundred thirteen billion, thirty-three million, two hundred fifty-four thousand, three hundred thirty-one".