642508463 has 2 divisors, whose sum is σ = 642508464. Its totient is φ = 642508462.

The previous prime is 642508459. The next prime is 642508483. The reversal of 642508463 is 364805246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642508463 - 2² = 642508459 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642508483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321254231 + 321254232.

It is an arithmetic number, because the mean of its divisors is an integer number (321254232).

Almost surely, 2^642508463 is an apocalyptic number.

642508463 is a deficient number, since it is larger than the sum of its proper divisors (1).

642508463 is an equidigital number, since it uses as much as digits as its factorization.

642508463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 642508463 is about 25347.7506497125. The cubic root of 642508463 is about 862.8983081679.

The spelling of 642508463 in words is "six hundred forty-two million, five hundred eight thousand, four hundred sixty-three".