172166600549 has 2 divisors, whose sum is σ = 172166600550. Its totient is φ = 172166600548.

The previous prime is 172166600477. The next prime is 172166600561. The reversal of 172166600549 is 945006661271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152270087524 + 19896513025 = 390218^2 + 141055^2 .

It is a cyclic number.

It is not a de Polignac number, because 172166600549 - 2²⁴ = 172149823333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172166603549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86083300274 + 86083300275.

It is an arithmetic number, because the mean of its divisors is an integer number (86083300275).

Almost surely, 2^172166600549 is an apocalyptic number.

It is an amenable number.

172166600549 is a deficient number, since it is larger than the sum of its proper divisors (1).

172166600549 is an equidigital number, since it uses as much as digits as its factorization.

172166600549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 172166600549 in words is "one hundred seventy-two billion, one hundred sixty-six million, six hundred thousand, five hundred forty-nine".