166710628252609 has 15 divisors (see below), whose sum is σ = 194484898730913. Its totient is φ = 142894281927348.

The previous prime is 166710628252603. The next prime is 166710628252613. The reversal of 166710628252609 is 906252826017661.

The square root of 166710628252609 is 12911647.

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

It is not a de Polignac number, because 166710628252609 - 2⁵ = 166710628252577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166710628252603) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 632538952 + ... + 632802454.

Almost surely, 2^{166710628252609} is an apocalyptic number.

166710628252609 is the 12911647-th square number.

166710628252609 is the 6455824-th centered octagonal number.

It is an amenable number.

166710628252609 is a deficient number, since it is larger than the sum of its proper divisors (27774270478304).

166710628252609 is an frugal number, since it uses more digits than its factorization.

166710628252609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527034 (or 263510 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 166710628252609 in words is "one hundred sixty-six trillion, seven hundred ten billion, six hundred twenty-eight million, two hundred fifty-two thousand, six hundred nine".