166738866738 has 16 divisors (see below), whose sum is σ = 334933970880. Its totient is φ = 55336916016.

The previous prime is 166738866737. The next prime is 166738866743. The reversal of 166738866738 is 837668837661.

It is not an unprimeable number, because it can be changed into a prime (166738866737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60675070 + ... + 60677817.

It is an arithmetic number, because the mean of its divisors is an integer number (20933373180).

Almost surely, 2^166738866738 is an apocalyptic number.

166738866738 is an abundant number, since it is smaller than the sum of its proper divisors (168195104142).

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

166738866738 is a wasteful number, since it uses less digits than its factorization.

166738866738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121353121.

The product of its digits is 292626432, while the sum is 69.

The spelling of 166738866738 in words is "one hundred sixty-six billion, seven hundred thirty-eight million, eight hundred sixty-six thousand, seven hundred thirty-eight".