155565066011 has 4 divisors (see below), whose sum is σ = 155838467400. Its totient is φ = 155291664624.

The previous prime is 155565065989. The next prime is 155565066031. The reversal of 155565066011 is 110660565551.

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

It is a cyclic number.

It is not a de Polignac number, because 155565066011 - 2³⁰ = 154491324187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155565066011.

It is not an unprimeable number, because it can be changed into a prime (155565066031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136699841 + ... + 136700978.

It is an arithmetic number, because the mean of its divisors is an integer number (38959616850).

Almost surely, 2^155565066011 is an apocalyptic number.

155565066011 is a deficient number, since it is larger than the sum of its proper divisors (273401389).

155565066011 is an equidigital number, since it uses as much as digits as its factorization.

155565066011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273401388.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 155565066011 in words is "one hundred fifty-five billion, five hundred sixty-five million, sixty-six thousand, eleven".