166061505559 has 8 divisors (see below), whose sum is σ = 167994794000. Its totient is φ = 164135668032.

The previous prime is 166061505523. The next prime is 166061505613. The reversal of 166061505559 is 955505160661.

It is a happy number.

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 166061505559 - 2⁷ = 166061505431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166061515559) 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, 1817889 + ... + 1907050.

It is an arithmetic number, because the mean of its divisors is an integer number (20999349250).

Almost surely, 2^166061505559 is an apocalyptic number.

166061505559 is a deficient number, since it is larger than the sum of its proper divisors (1933288441).

166061505559 is a wasteful number, since it uses less digits than its factorization.

166061505559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3725457.

The product of its (nonzero) digits is 1215000, while the sum is 49.

The spelling of 166061505559 in words is "one hundred sixty-six billion, sixty-one million, five hundred five thousand, five hundred fifty-nine".