166138578790 has 16 divisors (see below), whose sum is σ = 309361492080. Its totient is φ = 64163864800.

The previous prime is 166138578769. The next prime is 166138578791. The reversal of 166138578790 is 97875831661.

166138578790 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×166138578790² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166138578791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286445536 + ... + 286446115.

It is an arithmetic number, because the mean of its divisors is an integer number (19335093255).

Almost surely, 2^166138578790 is an apocalyptic number.

166138578790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166138578790 is a deficient number, since it is larger than the sum of its proper divisors (143222913290).

166138578790 is a wasteful number, since it uses less digits than its factorization.

166138578790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572891687.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 166138578790 in words is "one hundred sixty-six billion, one hundred thirty-eight million, five hundred seventy-eight thousand, seven hundred ninety".