642563711 has 2 divisors, whose sum is σ = 642563712. Its totient is φ = 642563710.

The previous prime is 642563699. The next prime is 642563731. The reversal of 642563711 is 117365246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642563711 - 2¹⁴ = 642547327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642563731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321281855 + 321281856.

It is an arithmetic number, because the mean of its divisors is an integer number (321281856).

Almost surely, 2^642563711 is an apocalyptic number.

642563711 is a deficient number, since it is larger than the sum of its proper divisors (1).

642563711 is an equidigital number, since it uses as much as digits as its factorization.

642563711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 642563711 is about 25348.8404271280. The cubic root of 642563711 is about 862.9230404176.

The spelling of 642563711 in words is "six hundred forty-two million, five hundred sixty-three thousand, seven hundred eleven".