642456265243 has 16 divisors (see below), whose sum is σ = 715891171072. Its totient is φ = 572542992000.

The previous prime is 642456265189. The next prime is 642456265301. The reversal of 642456265243 is 342562654246.

It is a cyclic number.

It is not a de Polignac number, because 642456265243 - 2²⁹ = 641919394331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642456269243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1723668 + ... + 2062993.

It is an arithmetic number, because the mean of its divisors is an integer number (44743198192).

Almost surely, 2^642456265243 is an apocalyptic number.

642456265243 is a deficient number, since it is larger than the sum of its proper divisors (73434905829).

642456265243 is a wasteful number, since it uses less digits than its factorization.

642456265243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3787126.

The product of its digits is 8294400, while the sum is 49.

The spelling of 642456265243 in words is "six hundred forty-two billion, four hundred fifty-six million, two hundred sixty-five thousand, two hundred forty-three".