642018717 has 20 divisors (see below), whose sum is σ = 974794876. Its totient is φ = 420992640.

The previous prime is 642018703. The next prime is 642018737. The reversal of 642018717 is 717810246.

642018717 is a `hidden beast` number, since 642 + 0 + 1 + 8 + 7 + 1 + 7 = 666.

642018717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 99082116 + 542936601 = 9954^2 + 23301^2 .

It is not a de Polignac number, because 642018717 - 2¹⁰ = 642017693 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 (642018737) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 60028 + ... + 69909.

Almost surely, 2^642018717 is an apocalyptic number.

It is an amenable number.

642018717 is a deficient number, since it is larger than the sum of its proper divisors (332776159).

642018717 is a wasteful number, since it uses less digits than its factorization.

642018717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130010 (or 130001 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 642018717 is about 25338.0882664814. The cubic root of 642018717 is about 862.6790070799.

The spelling of 642018717 in words is "six hundred forty-two million, eighteen thousand, seven hundred seventeen".