172205570561 has 2 divisors, whose sum is σ = 172205570562. Its totient is φ = 172205570560.

The previous prime is 172205570557. The next prime is 172205570591. The reversal of 172205570561 is 165075502271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165441495025 + 6764075536 = 406745^2 + 82244^2 .

It is a cyclic number.

It is not a de Polignac number, because 172205570561 - 2² = 172205570557 is a prime.

It is not a weakly prime, because it can be changed into another prime (172205570521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86102785280 + 86102785281.

It is an arithmetic number, because the mean of its divisors is an integer number (86102785281).

Almost surely, 2^172205570561 is an apocalyptic number.

It is an amenable number.

172205570561 is a deficient number, since it is larger than the sum of its proper divisors (1).

172205570561 is an equidigital number, since it uses as much as digits as its factorization.

172205570561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 147000, while the sum is 41.

The spelling of 172205570561 in words is "one hundred seventy-two billion, two hundred five million, five hundred seventy thousand, five hundred sixty-one".