642206421575 has 12 divisors (see below), whose sum is σ = 796347389880. Its totient is φ = 513757764960.

The previous prime is 642206421569. The next prime is 642206421589. The reversal of 642206421575 is 575124602246.

It is not a de Polignac number, because 642206421575 - 2¹⁸ = 642206159431 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2195021 + ... + 2470329.

It is an arithmetic number, because the mean of its divisors is an integer number (66362282490).

Almost surely, 2^642206421575 is an apocalyptic number.

642206421575 is a deficient number, since it is larger than the sum of its proper divisors (154140968305).

642206421575 is a wasteful number, since it uses less digits than its factorization.

642206421575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368626 (or 368621 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 44.

The spelling of 642206421575 in words is "six hundred forty-two billion, two hundred six million, four hundred twenty-one thousand, five hundred seventy-five".