642353785121 has 8 divisors (see below), whose sum is σ = 652708497600. Its totient is φ = 632079654448.

The previous prime is 642353784997. The next prime is 642353785159. The reversal of 642353785121 is 121587353246.

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 642353785121 - 2¹⁰ = 642353784097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642353785721) 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, 20129381 + ... + 20161266.

It is an arithmetic number, because the mean of its divisors is an integer number (81588562200).

Almost surely, 2^642353785121 is an apocalyptic number.

It is an amenable number.

642353785121 is a deficient number, since it is larger than the sum of its proper divisors (10354712479).

642353785121 is a wasteful number, since it uses less digits than its factorization.

642353785121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40290903.

The product of its digits is 1209600, while the sum is 47.

The spelling of 642353785121 in words is "six hundred forty-two billion, three hundred fifty-three million, seven hundred eighty-five thousand, one hundred twenty-one".