642463455638 has 8 divisors (see below), whose sum is σ = 965588495760. Its totient is φ = 320600623720.

The previous prime is 642463455637. The next prime is 642463455649. The reversal of 642463455638 is 836554364246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642463455637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315550778 + ... + 315552813.

It is an arithmetic number, because the mean of its divisors is an integer number (120698561970).

Almost surely, 2^642463455638 is an apocalyptic number.

642463455638 is a deficient number, since it is larger than the sum of its proper divisors (323125040122).

642463455638 is a wasteful number, since it uses less digits than its factorization.

642463455638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631104102.

The product of its digits is 49766400, while the sum is 56.

The spelling of 642463455638 in words is "six hundred forty-two billion, four hundred sixty-three million, four hundred fifty-five thousand, six hundred thirty-eight".