155165165551111 has 32 divisors (see below), whose sum is σ = 161462131084800. Its totient is φ = 148983139762560.

The previous prime is 155165165551079. The next prime is 155165165551157. The reversal of 155165165551111 is 111155561561551.

It is a cyclic number.

It is not a de Polignac number, because 155165165551111 - 2⁵ = 155165165551079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155165165551171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11351603785 + ... + 11351617453.

It is an arithmetic number, because the mean of its divisors is an integer number (5045691596400).

Almost surely, 2^{155165165551111} is an apocalyptic number.

155165165551111 is a deficient number, since it is larger than the sum of its proper divisors (6296965533689).

155165165551111 is a wasteful number, since it uses less digits than its factorization.

155165165551111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17719.

The product of its digits is 562500, while the sum is 49.

The spelling of 155165165551111 in words is "one hundred fifty-five trillion, one hundred sixty-five billion, one hundred sixty-five million, five hundred fifty-one thousand, one hundred eleven".