642735563 has 2 divisors, whose sum is σ = 642735564. Its totient is φ = 642735562.

The previous prime is 642735559. The next prime is 642735571. The reversal of 642735563 is 365537246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642735563 - 2² = 642735559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642735563.

It is not a weakly prime, because it can be changed into another prime (642735593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321367781 + 321367782.

It is an arithmetic number, because the mean of its divisors is an integer number (321367782).

Almost surely, 2^642735563 is an apocalyptic number.

642735563 is a deficient number, since it is larger than the sum of its proper divisors (1).

642735563 is an equidigital number, since it uses as much as digits as its factorization.

642735563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 41.

The square root of 642735563 is about 25352.2299413681. The cubic root of 642735563 is about 862.9999624044. Note that the first 4 decimals are identical.

The spelling of 642735563 in words is "six hundred forty-two million, seven hundred thirty-five thousand, five hundred sixty-three".