642268688686 has 32 divisors (see below), whose sum is σ = 1016005939200. Its totient is φ = 303663840480.

The previous prime is 642268688603. The next prime is 642268688687. The reversal of 642268688686 is 686886862246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642268688687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49808856 + ... + 49821748.

It is an arithmetic number, because the mean of its divisors is an integer number (31750185600).

Almost surely, 2^642268688686 is an apocalyptic number.

642268688686 is a deficient number, since it is larger than the sum of its proper divisors (373737250514).

642268688686 is a wasteful number, since it uses less digits than its factorization.

642268688686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15264.

The product of its digits is 509607936, while the sum is 70.

The spelling of 642268688686 in words is "six hundred forty-two billion, two hundred sixty-eight million, six hundred eighty-eight thousand, six hundred eighty-six".