166534502551345 has 8 divisors (see below), whose sum is σ = 199842861761064. Its totient is φ = 133226629574784.

The previous prime is 166534502551343. The next prime is 166534502551381. The reversal of 166534502551345 is 543155205435661.

It can be written as a sum of positive squares in 4 ways, for example, as 2244965819041 + 164289536732304 = 1498321^2 + 12817548^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166534502551345 - 2¹ = 166534502551343 is a prime.

It is a super-3 number, since 3×166534502551345³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166534502551343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120804364 + ... + 122175133.

It is an arithmetic number, because the mean of its divisors is an integer number (24980357720133).

Almost surely, 2^{166534502551345} is an apocalyptic number.

It is an amenable number.

166534502551345 is a deficient number, since it is larger than the sum of its proper divisors (33308359209719).

166534502551345 is a wasteful number, since it uses less digits than its factorization.

166534502551345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243116579.

The product of its (nonzero) digits is 32400000, while the sum is 55.

The spelling of 166534502551345 in words is "one hundred sixty-six trillion, five hundred thirty-four billion, five hundred two million, five hundred fifty-one thousand, three hundred forty-five".