642166303 has 2 divisors, whose sum is σ = 642166304. Its totient is φ = 642166302.

The previous prime is 642166249. The next prime is 642166367. The reversal of 642166303 is 303661246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642166303 - 2⁹ = 642165791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642166403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321083151 + 321083152.

It is an arithmetic number, because the mean of its divisors is an integer number (321083152).

Almost surely, 2^642166303 is an apocalyptic number.

642166303 is a deficient number, since it is larger than the sum of its proper divisors (1).

642166303 is an equidigital number, since it uses as much as digits as its factorization.

642166303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 642166303 is about 25341.0004340792. Note that the first 3 decimals coincide. The cubic root of 642166303 is about 862.7451056665.

The spelling of 642166303 in words is "six hundred forty-two million, one hundred sixty-six thousand, three hundred three".