155507106505566 has 16 divisors (see below), whose sum is σ = 311020808310288. Its totient is φ = 51834602952000.

The previous prime is 155507106505547. The next prime is 155507106505643. The reversal of 155507106505566 is 665505601705551.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274497585 + ... + 275063516.

It is an arithmetic number, because the mean of its divisors is an integer number (19438800519393).

Almost surely, 2^{155507106505566} is an apocalyptic number.

155507106505566 is an abundant number, since it is smaller than the sum of its proper divisors (155513701804722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155507106505566 is a wasteful number, since it uses less digits than its factorization.

155507106505566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549608267.

The product of its (nonzero) digits is 23625000, while the sum is 57.

The spelling of 155507106505566 in words is "one hundred fifty-five trillion, five hundred seven billion, one hundred six million, five hundred five thousand, five hundred sixty-six".