642851675703863 has 4 divisors (see below), whose sum is σ = 646443025847640. Its totient is φ = 639260325560088.

The previous prime is 642851675703841. The next prime is 642851675703871. The reversal of 642851675703863 is 368307576158246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642851675703863 - 2²⁸ = 642851407268407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642851675703833) 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, 1795675071620 + ... + 1795675071977.

It is an arithmetic number, because the mean of its divisors is an integer number (161610756461910).

Almost surely, 2^{642851675703863} is an apocalyptic number.

642851675703863 is a deficient number, since it is larger than the sum of its proper divisors (3591350143777).

642851675703863 is a wasteful number, since it uses less digits than its factorization.

642851675703863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3591350143776.

The product of its (nonzero) digits is 1219276800, while the sum is 71.

The spelling of 642851675703863 in words is "six hundred forty-two trillion, eight hundred fifty-one billion, six hundred seventy-five million, seven hundred three thousand, eight hundred sixty-three".