428186615314321 has 2 divisors, whose sum is σ = 428186615314322. Its totient is φ = 428186615314320.

The previous prime is 428186615314313. The next prime is 428186615314387. The reversal of 428186615314321 is 123413516681824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 423514338527296 + 4672276787025 = 20579464^2 + 2161545^2 .

It is a cyclic number.

It is not a de Polignac number, because 428186615314321 - 2³ = 428186615314313 is a prime.

It is not a weakly prime, because it can be changed into another prime (428186615314391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214093307657160 + 214093307657161.

It is an arithmetic number, because the mean of its divisors is an integer number (214093307657161).

Almost surely, 2^{428186615314321} is an apocalyptic number.

It is an amenable number.

428186615314321 is a deficient number, since it is larger than the sum of its proper divisors (1).

428186615314321 is an equidigital number, since it uses as much as digits as its factorization.

428186615314321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6635520, while the sum is 55.

The spelling of 428186615314321 in words is "four hundred twenty-eight trillion, one hundred eighty-six billion, six hundred fifteen million, three hundred fourteen thousand, three hundred twenty-one".