642746363643 has 6 divisors (see below), whose sum is σ = 928411414164. Its totient is φ = 428497575756.

The previous prime is 642746363629. The next prime is 642746363653. The reversal of 642746363643 is 346363647246.

642746363643 is a `hidden beast` number, since 6 + 4 + 274 + 6 + 3 + 6 + 364 + 3 = 666.

It is not a de Polignac number, because 642746363643 - 2¹⁰ = 642746362619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642746363643.

It is not an unprimeable number, because it can be changed into a prime (642746363653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35708131305 + ... + 35708131322.

It is an arithmetic number, because the mean of its divisors is an integer number (154735235694).

Almost surely, 2^642746363643 is an apocalyptic number.

642746363643 is a deficient number, since it is larger than the sum of its proper divisors (285665050521).

642746363643 is a wasteful number, since it uses less digits than its factorization.

642746363643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71416262633 (or 71416262630 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 54.

The spelling of 642746363643 in words is "six hundred forty-two billion, seven hundred forty-six million, three hundred sixty-three thousand, six hundred forty-three".