18878060422321 has 3 divisors (see below), whose sum is σ = 18878064767211. Its totient is φ = 18878056077432.

The previous prime is 18878060422307. The next prime is 18878060422337. The reversal of 18878060422321 is 12322406087881.

The square root of 18878060422321 is 4344889.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 9784940791921 + 9093119630400 = 3128089^2 + 3015480^2 .

It is not a de Polignac number, because 18878060422321 - 2¹⁵ = 18878060389553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18878060422121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2172445 + ... + 6517333.

It is an arithmetic number, because the mean of its divisors is an integer number (6292688255737).

Almost surely, 2^{18878060422321} is an apocalyptic number.

18878060422321 is the 4344889-th square number.

18878060422321 is the 2172445-th centered octagonal number.

It is an amenable number.

18878060422321 is a deficient number, since it is larger than the sum of its proper divisors (4344890).

18878060422321 is an frugal number, since it uses more digits than its factorization.

18878060422321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8689778 (or 4344889 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 52.

The spelling of 18878060422321 in words is "eighteen trillion, eight hundred seventy-eight billion, sixty million, four hundred twenty-two thousand, three hundred twenty-one".