642548363 has 2 divisors, whose sum is σ = 642548364. Its totient is φ = 642548362.

The previous prime is 642548329. The next prime is 642548411. The reversal of 642548363 is 363845246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642548363 - 2⁸ = 642548107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642548363.

It is not a weakly prime, because it can be changed into another prime (642548063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321274181 + 321274182.

It is an arithmetic number, because the mean of its divisors is an integer number (321274182).

Almost surely, 2^642548363 is an apocalyptic number.

642548363 is a deficient number, since it is larger than the sum of its proper divisors (1).

642548363 is an equidigital number, since it uses as much as digits as its factorization.

642548363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 41.

The square root of 642548363 is about 25348.5376895789. The cubic root of 642548363 is about 862.9161698936.

The spelling of 642548363 in words is "six hundred forty-two million, five hundred forty-eight thousand, three hundred sixty-three".