166630738738 has 4 divisors (see below), whose sum is σ = 249946108110. Its totient is φ = 83315369368.

The previous prime is 166630738711. The next prime is 166630738763. The reversal of 166630738738 is 837837036661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 837837036661 = 96589 ⋅8674249.

It can be written as a sum of positive squares in only one way, i.e., 128405405569 + 38225333169 = 358337^2 + 195513^2 .

It is a super-2 number, since 2×166630738738² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41657684683 + ... + 41657684686.

Almost surely, 2^166630738738 is an apocalyptic number.

166630738738 is a deficient number, since it is larger than the sum of its proper divisors (83315369372).

166630738738 is an equidigital number, since it uses as much as digits as its factorization.

166630738738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83315369371.

The product of its (nonzero) digits is 18289152, while the sum is 58.

The spelling of 166630738738 in words is "one hundred sixty-six billion, six hundred thirty million, seven hundred thirty-eight thousand, seven hundred thirty-eight".