55170018 has 32 divisors (see below), whose sum is σ = 126558720. Its totient is φ = 17796240.

The previous prime is 55170013. The next prime is 55170019. The reversal of 55170018 is 81007155.

It is a super-5 number, since 5×55170018⁵ (a number of 40 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 55169973 and 55170000.

It is not an unprimeable number, because it can be changed into a prime (55170013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14805 + ... + 18152.

It is an arithmetic number, because the mean of its divisors is an integer number (3954960).

Almost surely, 2^55170018 is an apocalyptic number.

55170018 is an abundant number, since it is smaller than the sum of its proper divisors (71388702).

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

55170018 is a wasteful number, since it uses less digits than its factorization.

55170018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32999 (or 32993 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

The square root of 55170018 is about 7427.6522535725. The cubic root of 55170018 is about 380.6867038212.

The spelling of 55170018 in words is "fifty-five million, one hundred seventy thousand, eighteen".