166418791928878 has 32 divisors (see below), whose sum is σ = 258002342357760. Its totient is φ = 80424727130880.

The previous prime is 166418791928869. The next prime is 166418791928993. The reversal of 166418791928878 is 878829197814661.

It is a junction number, because it is equal to n+sod(n) for n = 166418791928795 and 166418791928804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 689186668 + ... + 689428096.

It is an arithmetic number, because the mean of its divisors is an integer number (8062573198680).

Almost surely, 2^{166418791928878} is an apocalyptic number.

166418791928878 is a deficient number, since it is larger than the sum of its proper divisors (91583550428882).

166418791928878 is a wasteful number, since it uses less digits than its factorization.

166418791928878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255292.

The product of its digits is 4682022912, while the sum is 85.

The spelling of 166418791928878 in words is "one hundred sixty-six trillion, four hundred eighteen billion, seven hundred ninety-one million, nine hundred twenty-eight thousand, eight hundred seventy-eight".