642255138599 has 16 divisors (see below), whose sum is σ = 665120937600. Its totient is φ = 619846745856.

The previous prime is 642255138583. The next prime is 642255138617. The reversal of 642255138599 is 995831552246.

It is a cyclic number.

It is not a de Polignac number, because 642255138599 - 2⁴ = 642255138583 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 (642255138529) 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, 841187 + ... + 1411419.

It is an arithmetic number, because the mean of its divisors is an integer number (41570058600).

Almost surely, 2^642255138599 is an apocalyptic number.

642255138599 is a deficient number, since it is larger than the sum of its proper divisors (22865799001).

642255138599 is a wasteful number, since it uses less digits than its factorization.

642255138599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570634.

The product of its digits is 23328000, while the sum is 59.

The spelling of 642255138599 in words is "six hundred forty-two billion, two hundred fifty-five million, one hundred thirty-eight thousand, five hundred ninety-nine".