166555136154 has 128 divisors (see below), whose sum is σ = 379339220736. Its totient is φ = 48312320000.

The previous prime is 166555136149. The next prime is 166555136207. The reversal of 166555136154 is 451631555661.

It is a happy number.

It is a super-5 number, since 5×166555136154⁵ (a number of 57 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30880882 + ... + 30886274.

It is an arithmetic number, because the mean of its divisors is an integer number (2963587662).

Almost surely, 2^166555136154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166555136154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189669610368).

166555136154 is an abundant number, since it is smaller than the sum of its proper divisors (212784084582).

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

166555136154 is a wasteful number, since it uses less digits than its factorization.

166555136154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5664.

The product of its digits is 1620000, while the sum is 48.

The spelling of 166555136154 in words is "one hundred sixty-six billion, five hundred fifty-five million, one hundred thirty-six thousand, one hundred fifty-four".