642162023 has 2 divisors, whose sum is σ = 642162024. Its totient is φ = 642162022.

The previous prime is 642162011. The next prime is 642162071. The reversal of 642162023 is 320261246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642162023 - 2¹⁴ = 642145639 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 642161983 and 642162001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642162083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321081011 + 321081012.

It is an arithmetic number, because the mean of its divisors is an integer number (321081012).

Almost surely, 2^642162023 is an apocalyptic number.

642162023 is a deficient number, since it is larger than the sum of its proper divisors (1).

642162023 is an equidigital number, since it uses as much as digits as its factorization.

642162023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 642162023 is about 25340.9159858124. The cubic root of 642162023 is about 862.7431889474.

The spelling of 642162023 in words is "six hundred forty-two million, one hundred sixty-two thousand, twenty-three".