180484651661 has 2 divisors, whose sum is σ = 180484651662. Its totient is φ = 180484651660.

The previous prime is 180484651643. The next prime is 180484651747. The reversal of 180484651661 is 166156484081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180471182761 + 13468900 = 424819^2 + 3670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180484651661 is a prime.

It is a super-4 number, since 4×180484651661⁴ (a number of 46 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180484651631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90242325830 + 90242325831.

It is an arithmetic number, because the mean of its divisors is an integer number (90242325831).

Almost surely, 2^180484651661 is an apocalyptic number.

It is an amenable number.

180484651661 is a deficient number, since it is larger than the sum of its proper divisors (1).

180484651661 is an equidigital number, since it uses as much as digits as its factorization.

180484651661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1105920, while the sum is 50.

The spelling of 180484651661 in words is "one hundred eighty billion, four hundred eighty-four million, six hundred fifty-one thousand, six hundred sixty-one".