166515616568 has 64 divisors (see below), whose sum is σ = 373458885120. Its totient is φ = 68054659200.

The previous prime is 166515616567. The next prime is 166515616613. The reversal of 166515616568 is 865616515661.

It is a super-2 number, since 2×166515616568² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166515616567) 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, 231038 + ... + 621618.

It is an arithmetic number, because the mean of its divisors is an integer number (5835295080).

Almost surely, 2^166515616568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166515616568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186729442560).

166515616568 is an abundant number, since it is smaller than the sum of its proper divisors (206943268552).

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

166515616568 is a wasteful number, since it uses less digits than its factorization.

166515616568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390948 (or 390944 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 56.

The spelling of 166515616568 in words is "one hundred sixty-six billion, five hundred fifteen million, six hundred sixteen thousand, five hundred sixty-eight".