180648422921 has 4 divisors (see below), whose sum is σ = 180660712452. Its totient is φ = 180636133392.

The previous prime is 180648422897. The next prime is 180648422939. The reversal of 180648422921 is 129224846081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129224846081 = 164089 ⋅787529.

It can be written as a sum of positive squares in 2 ways, for example, as 128999497225 + 51648925696 = 359165^2 + 227264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180648422921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (180648422951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6122690 + ... + 6152123.

It is an arithmetic number, because the mean of its divisors is an integer number (45165178113).

Almost surely, 2^180648422921 is an apocalyptic number.

It is an amenable number.

180648422921 is a deficient number, since it is larger than the sum of its proper divisors (12289531).

180648422921 is a wasteful number, since it uses less digits than its factorization.

180648422921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12289530.

The product of its (nonzero) digits is 442368, while the sum is 47.

The spelling of 180648422921 in words is "one hundred eighty billion, six hundred forty-eight million, four hundred twenty-two thousand, nine hundred twenty-one".