166273926289 has 9 divisors (see below), whose sum is σ = 173827349563. Its totient is φ = 159035654272.

The previous prime is 166273926277. The next prime is 166273926293. The reversal of 166273926289 is 982629372661.

The square root of 166273926289 is 407767.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 111667583889 + 54606342400 = 334167^2 + 233680^2 .

It is not a de Polignac number, because 166273926289 - 2⁵ = 166273926257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166273926239) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9369777 + ... + 9387505.

Almost surely, 2^166273926289 is an apocalyptic number.

166273926289 is the 407767-th square number.

166273926289 is the 203884-th centered octagonal number.

It is an amenable number.

166273926289 is a deficient number, since it is larger than the sum of its proper divisors (7553423274).

166273926289 is an frugal number, since it uses more digits than its factorization.

166273926289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35504 (or 17752 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 61.

The spelling of 166273926289 in words is "one hundred sixty-six billion, two hundred seventy-three million, nine hundred twenty-six thousand, two hundred eighty-nine".