642445028173 has 8 divisors (see below), whose sum is σ = 691875044000. Its totient is φ = 593016607728.

The previous prime is 642445028131. The next prime is 642445028179. The reversal of 642445028173 is 371820544246.

642445028173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 642445028173 - 2³⁷ = 505006074701 is a prime.

It is a super-2 number, since 2×642445028173² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642445028179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 515098 + ... + 1245076.

It is an arithmetic number, because the mean of its divisors is an integer number (86484380500).

Almost surely, 2^642445028173 is an apocalyptic number.

It is an amenable number.

642445028173 is a deficient number, since it is larger than the sum of its proper divisors (49430015827).

642445028173 is a wasteful number, since it uses less digits than its factorization.

642445028173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797691.

The product of its (nonzero) digits is 1290240, while the sum is 46.

The spelling of 642445028173 in words is "six hundred forty-two billion, four hundred forty-five million, twenty-eight thousand, one hundred seventy-three".