180368320647661 has 8 divisors (see below), whose sum is σ = 181517526902840. Its totient is φ = 179219118993408.

The previous prime is 180368320647617. The next prime is 180368320647667. The reversal of 180368320647661 is 166746023863081.

It can be written as a sum of positive squares in 4 ways, for example, as 39476026170025 + 140892294477636 = 6282995^2 + 11869806^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 180368320647661 - 2¹³ = 180368320639469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 180368320647661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180368320647667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114298765 + ... + 115866061.

It is an arithmetic number, because the mean of its divisors is an integer number (22689690862855).

Almost surely, 2^{180368320647661} is an apocalyptic number.

It is an amenable number.

180368320647661 is a deficient number, since it is larger than the sum of its proper divisors (1149206255179).

180368320647661 is a wasteful number, since it uses less digits than its factorization.

180368320647661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300463.

The product of its (nonzero) digits is 41803776, while the sum is 61.

The spelling of 180368320647661 in words is "one hundred eighty trillion, three hundred sixty-eight billion, three hundred twenty million, six hundred forty-seven thousand, six hundred sixty-one".