166104128827 has 16 divisors (see below), whose sum is σ = 204446575872. Its totient is φ = 131416152480.

The previous prime is 166104128809. The next prime is 166104128843. The reversal of 166104128827 is 728821401661.

It is a cyclic number.

It is not a de Polignac number, because 166104128827 - 2³¹ = 163956645179 is a prime.

It is a super-2 number, since 2×166104128827² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166104128807) 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, 2355552 + ... + 2425042.

It is an arithmetic number, because the mean of its divisors is an integer number (12777910992).

Almost surely, 2^166104128827 is an apocalyptic number.

166104128827 is a deficient number, since it is larger than the sum of its proper divisors (38342447045).

166104128827 is a wasteful number, since it uses less digits than its factorization.

166104128827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95778.

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 166104128827 in words is "one hundred sixty-six billion, one hundred four million, one hundred twenty-eight thousand, eight hundred twenty-seven".