172205761361 has 8 divisors (see below), whose sum is σ = 176711655624. Its totient is φ = 167714426880.

The previous prime is 172205761333. The next prime is 172205761363. The reversal of 172205761361 is 163167502271.

It can be written as a sum of positive squares in 4 ways, for example, as 20763369025 + 151442392336 = 144095^2 + 389156^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172205761361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172205761363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3615980 + ... + 3663293.

It is an arithmetic number, because the mean of its divisors is an integer number (22088956953).

Almost surely, 2^172205761361 is an apocalyptic number.

It is an amenable number.

172205761361 is a deficient number, since it is larger than the sum of its proper divisors (4505894263).

172205761361 is an equidigital number, since it uses as much as digits as its factorization.

172205761361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7279891.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 172205761361 in words is "one hundred seventy-two billion, two hundred five million, seven hundred sixty-one thousand, three hundred sixty-one".