642587801686 has 8 divisors (see below), whose sum is σ = 964878480720. Its totient is φ = 320961641448.

The previous prime is 642587801683. The next prime is 642587801699. The reversal of 642587801686 is 686108785246.

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 (642587801683) 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, 166127281 + ... + 166131148.

It is an arithmetic number, because the mean of its divisors is an integer number (120609810090).

Almost surely, 2^642587801686 is an apocalyptic number.

642587801686 is a deficient number, since it is larger than the sum of its proper divisors (322290679034).

642587801686 is a wasteful number, since it uses less digits than its factorization.

642587801686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332259398.

The product of its (nonzero) digits is 30965760, while the sum is 61.

The spelling of 642587801686 in words is "six hundred forty-two billion, five hundred eighty-seven million, eight hundred one thousand, six hundred eighty-six".