165566101055 has 32 divisors (see below), whose sum is σ = 212330289600. Its totient is φ = 123498790912.

The previous prime is 165566101007. The next prime is 165566101069. The reversal of 165566101055 is 550101665561.

It is a cyclic number.

It is not a de Polignac number, because 165566101055 - 2¹⁰ = 165566100031 is a prime.

It is a super-2 number, since 2×165566101055² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38600351 + ... + 38604639.

It is an arithmetic number, because the mean of its divisors is an integer number (6635321550).

Almost surely, 2^165566101055 is an apocalyptic number.

165566101055 is a deficient number, since it is larger than the sum of its proper divisors (46764188545).

165566101055 is a wasteful number, since it uses less digits than its factorization.

165566101055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8443.

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

The spelling of 165566101055 in words is "one hundred sixty-five billion, five hundred sixty-six million, one hundred one thousand, fifty-five".