642463943686 has 16 divisors (see below), whose sum is σ = 976186436400. Its totient is φ = 317075447008.

The previous prime is 642463943677. The next prime is 642463943699. The reversal of 642463943686 is 686349364246.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1560841 + ... + 1929028.

It is an arithmetic number, because the mean of its divisors is an integer number (61011652275).

Almost surely, 2^642463943686 is an apocalyptic number.

642463943686 is a deficient number, since it is larger than the sum of its proper divisors (333722492714).

642463943686 is a wasteful number, since it uses less digits than its factorization.

642463943686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3491063.

The product of its digits is 107495424, while the sum is 61.

The spelling of 642463943686 in words is "six hundred forty-two billion, four hundred sixty-three million, nine hundred forty-three thousand, six hundred eighty-six".