180696821749 has 2 divisors, whose sum is σ = 180696821750. Its totient is φ = 180696821748.

The previous prime is 180696821731. The next prime is 180696821827. The reversal of 180696821749 is 947128696081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180121301649 + 575520100 = 424407^2 + 23990^2 .

It is an emirp because it is prime and its reverse (947128696081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 180696821749 - 2⁵ = 180696821717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180696821849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90348410874 + 90348410875.

It is an arithmetic number, because the mean of its divisors is an integer number (90348410875).

Almost surely, 2^180696821749 is an apocalyptic number.

It is an amenable number.

180696821749 is a deficient number, since it is larger than the sum of its proper divisors (1).

180696821749 is an equidigital number, since it uses as much as digits as its factorization.

180696821749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10450944, while the sum is 61.

The spelling of 180696821749 in words is "one hundred eighty billion, six hundred ninety-six million, eight hundred twenty-one thousand, seven hundred forty-nine".