642286439623 has 2 divisors, whose sum is σ = 642286439624. Its totient is φ = 642286439622.

The previous prime is 642286439621. The next prime is 642286439681. The reversal of 642286439623 is 326934682246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642286439623 - 2¹ = 642286439621 is a prime.

Together with 642286439621, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642286439621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321143219811 + 321143219812.

It is an arithmetic number, because the mean of its divisors is an integer number (321143219812).

Almost surely, 2^642286439623 is an apocalyptic number.

642286439623 is a deficient number, since it is larger than the sum of its proper divisors (1).

642286439623 is an equidigital number, since it uses as much as digits as its factorization.

642286439623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17915904, while the sum is 55.

The spelling of 642286439623 in words is "six hundred forty-two billion, two hundred eighty-six million, four hundred thirty-nine thousand, six hundred twenty-three".