166001506165550 has 96 divisors (see below), whose sum is σ = 345055765017600. Its totient is φ = 58890487392000.

The previous prime is 166001506165529. The next prime is 166001506165577. The reversal of 166001506165550 is 55561605100661.

It is a super-4 number, since 4×166001506165550⁴ (a number of 58 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 166001506165495 and 166001506165504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1588798211 + ... + 1588902689.

It is an arithmetic number, because the mean of its divisors is an integer number (3594330885600).

Almost surely, 2^{166001506165550} is an apocalyptic number.

166001506165550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166001506165550 is an abundant number, since it is smaller than the sum of its proper divisors (179054258852050).

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

166001506165550 is a wasteful number, since it uses less digits than its factorization.

166001506165550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175002 (or 174997 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 47.

The spelling of 166001506165550 in words is "one hundred sixty-six trillion, one billion, five hundred six million, one hundred sixty-five thousand, five hundred fifty".