166728938737 has 4 divisors (see below), whose sum is σ = 167566772800. Its totient is φ = 165891104676.

The previous prime is 166728938731. The next prime is 166728938773. The reversal of 166728938737 is 737839827661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166728938737 - 2³ = 166728938729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166728938731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418916733 + ... + 418917130.

It is an arithmetic number, because the mean of its divisors is an integer number (41891693200).

Almost surely, 2^166728938737 is an apocalyptic number.

It is an amenable number.

166728938737 is a deficient number, since it is larger than the sum of its proper divisors (837834063).

166728938737 is an equidigital number, since it uses as much as digits as its factorization.

166728938737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837834062.

The product of its digits is 128024064, while the sum is 67.

The spelling of 166728938737 in words is "one hundred sixty-six billion, seven hundred twenty-eight million, nine hundred thirty-eight thousand, seven hundred thirty-seven".