18960877321 has 2 divisors, whose sum is σ = 18960877322. Its totient is φ = 18960877320.

The previous prime is 18960877297. The next prime is 18960877349. The reversal of 18960877321 is 12377806981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10188681721 + 8772195600 = 100939^2 + 93660^2 .

It is a cyclic number.

It is not a de Polignac number, because 18960877321 - 2⁵ = 18960877289 is a prime.

It is not a weakly prime, because it can be changed into another prime (18960877921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9480438660 + 9480438661.

It is an arithmetic number, because the mean of its divisors is an integer number (9480438661).

Almost surely, 2^18960877321 is an apocalyptic number.

It is an amenable number.

18960877321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18960877321 is an equidigital number, since it uses as much as digits as its factorization.

18960877321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The spelling of 18960877321 in words is "eighteen billion, nine hundred sixty million, eight hundred seventy-seven thousand, three hundred twenty-one".