166105555956 has 60 divisors (see below), whose sum is σ = 434597729412. Its totient is φ = 55321978752.

The previous prime is 166105555951. The next prime is 166105555963. The reversal of 166105555956 is 659555501661.

166105555956 is a `hidden beast` number, since 16 + 610 + 5 + 5 + 5 + 5 + 9 + 5 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 95997107556 + 70108448400 = 309834^2 + 264780^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166105555951) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 171666 + ... + 601398.

Almost surely, 2^166105555956 is an apocalyptic number.

It is an amenable number.

166105555956 is an abundant number, since it is smaller than the sum of its proper divisors (268492173456).

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

166105555956 is a wasteful number, since it uses less digits than its factorization.

166105555956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430942 (or 430931 counting only the distinct ones).

The product of its (nonzero) digits is 6075000, while the sum is 54.

The spelling of 166105555956 in words is "one hundred sixty-six billion, one hundred five million, five hundred fifty-five thousand, nine hundred fifty-six".