166443795855 has 24 divisors (see below), whose sum is σ = 297809116800. Its totient is φ = 85906474560.

The previous prime is 166443795841. The next prime is 166443795907. The reversal of 166443795855 is 558597344661.

It is a happy number.

166443795855 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 43 + 7 + 9 + 585 + 5 = 666.

It is not a de Polignac number, because 166443795855 - 2²⁰ = 166442747279 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166443795792 and 166443795801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59655880 + ... + 59658669.

It is an arithmetic number, because the mean of its divisors is an integer number (12408713200).

Almost surely, 2^166443795855 is an apocalyptic number.

166443795855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166443795855 is a deficient number, since it is larger than the sum of its proper divisors (131365320945).

166443795855 is a wasteful number, since it uses less digits than its factorization.

166443795855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119314591 (or 119314588 counting only the distinct ones).

The product of its digits is 108864000, while the sum is 63.

The spelling of 166443795855 in words is "one hundred sixty-six billion, four hundred forty-three million, seven hundred ninety-five thousand, eight hundred fifty-five".