642401925559 has 6 divisors (see below), whose sum is σ = 677992060320. Its totient is φ = 608591297556.

The previous prime is 642401925541. The next prime is 642401925563. The reversal of 642401925559 is 955529104246.

It is not a de Polignac number, because 642401925559 - 2⁹ = 642401925047 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 (642401925589) 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, 889752999 + ... + 889753720.

It is an arithmetic number, because the mean of its divisors is an integer number (112998676720).

Almost surely, 2^642401925559 is an apocalyptic number.

642401925559 is a deficient number, since it is larger than the sum of its proper divisors (35590134761).

642401925559 is a wasteful number, since it uses less digits than its factorization.

642401925559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779506757 (or 1779506738 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 642401925559 in words is "six hundred forty-two billion, four hundred one million, nine hundred twenty-five thousand, five hundred fifty-nine".