642963617 has 4 divisors (see below), whose sum is σ = 655095060. Its totient is φ = 630832176.

The previous prime is 642963583. The next prime is 642963637. The reversal of 642963617 is 716369246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716369246 = 2 ⋅358184623.

It can be written as a sum of positive squares in 2 ways, for example, as 593458321 + 49505296 = 24361^2 + 7036^2 .

It is a cyclic number.

It is not a de Polignac number, because 642963617 - 2⁸ = 642963361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642963637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6065642 + ... + 6065747.

It is an arithmetic number, because the mean of its divisors is an integer number (163773765).

Almost surely, 2^642963617 is an apocalyptic number.

It is an amenable number.

642963617 is a deficient number, since it is larger than the sum of its proper divisors (12131443).

642963617 is a wasteful number, since it uses less digits than its factorization.

642963617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12131442.

The product of its digits is 326592, while the sum is 44.

The square root of 642963617 is about 25356.7272533346. The cubic root of 642963617 is about 863.1020195759.

The spelling of 642963617 in words is "six hundred forty-two million, nine hundred sixty-three thousand, six hundred seventeen".