165555555061 has 12 divisors (see below), whose sum is σ = 179509062720. Its totient is φ = 152616906000.

The previous prime is 165555555049. The next prime is 165555555083. The reversal of 165555555061 is 160555555561.

It is not a de Polignac number, because 165555555061 - 2¹⁷ = 165555423989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165555554996 and 165555555014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165555555031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 525291 + ... + 779128.

It is an arithmetic number, because the mean of its divisors is an integer number (14959088560).

Almost surely, 2^165555555061 is an apocalyptic number.

It is an amenable number.

165555555061 is a deficient number, since it is larger than the sum of its proper divisors (13953507659).

165555555061 is a wasteful number, since it uses less digits than its factorization.

165555555061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305196 (or 1305183 counting only the distinct ones).

The product of its (nonzero) digits is 2812500, while the sum is 49.

The spelling of 165555555061 in words is "one hundred sixty-five billion, five hundred fifty-five million, five hundred fifty-five thousand, sixty-one".