180179721649 has 2 divisors, whose sum is σ = 180179721650. Its totient is φ = 180179721648.

The previous prime is 180179721629. The next prime is 180179721661. The reversal of 180179721649 is 946127971081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179770064049 + 409657600 = 423993^2 + 20240^2 .

It is a cyclic number.

It is not a de Polignac number, because 180179721649 - 2⁷ = 180179721521 is a prime.

It is a super-2 number, since 2×180179721649² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 180179721649.

It is not a weakly prime, because it can be changed into another prime (180179721619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90089860824 + 90089860825.

It is an arithmetic number, because the mean of its divisors is an integer number (90089860825).

Almost surely, 2^180179721649 is an apocalyptic number.

It is an amenable number.

180179721649 is a deficient number, since it is larger than the sum of its proper divisors (1).

180179721649 is an equidigital number, since it uses as much as digits as its factorization.

180179721649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 180179721649 in words is "one hundred eighty billion, one hundred seventy-nine million, seven hundred twenty-one thousand, six hundred forty-nine".