155511665530225 has 12 divisors (see below), whose sum is σ = 192835905877296. Its totient is φ = 124408402992080.

The previous prime is 155511665530187. The next prime is 155511665530253. The reversal of 155511665530225 is 522035566115551.

It is not a de Polignac number, because 155511665530225 - 2³⁹ = 154961909716337 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19812607 + ... + 26524756.

It is an arithmetic number, because the mean of its divisors is an integer number (16069658823108).

Almost surely, 2^{155511665530225} is an apocalyptic number.

It is an amenable number.

155511665530225 is a deficient number, since it is larger than the sum of its proper divisors (37324240347071).

155511665530225 is a wasteful number, since it uses less digits than its factorization.

155511665530225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46471616 (or 46471611 counting only the distinct ones).

The product of its (nonzero) digits is 6750000, while the sum is 52.

The spelling of 155511665530225 in words is "one hundred fifty-five trillion, five hundred eleven billion, six hundred sixty-five million, five hundred thirty thousand, two hundred twenty-five".