642442724571 has 8 divisors (see below), whose sum is σ = 886127896080. Its totient is φ = 413526351392.

The previous prime is 642442724557. The next prime is 642442724593. The reversal of 642442724571 is 175427244246.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642442724571 - 2⁶ = 642442724507 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642442724571.

It is not an unprimeable number, because it can be changed into a prime (642442724471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3692199480 + ... + 3692199653.

It is an arithmetic number, because the mean of its divisors is an integer number (110765987010).

Almost surely, 2^642442724571 is an apocalyptic number.

642442724571 is a deficient number, since it is larger than the sum of its proper divisors (243685171509).

642442724571 is a wasteful number, since it uses less digits than its factorization.

642442724571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7384399165.

The product of its digits is 3010560, while the sum is 48.

The spelling of 642442724571 in words is "six hundred forty-two billion, four hundred forty-two million, seven hundred twenty-four thousand, five hundred seventy-one".