642673583 has 2 divisors, whose sum is σ = 642673584. Its totient is φ = 642673582.

The previous prime is 642673573. The next prime is 642673621. The reversal of 642673583 is 385376246.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642673583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642673523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321336791 + 321336792.

It is an arithmetic number, because the mean of its divisors is an integer number (321336792).

Almost surely, 2^642673583 is an apocalyptic number.

642673583 is a deficient number, since it is larger than the sum of its proper divisors (1).

642673583 is an equidigital number, since it uses as much as digits as its factorization.

642673583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 44.

The square root of 642673583 is about 25351.0075342184. The cubic root of 642673583 is about 862.9722213654.

The spelling of 642673583 in words is "six hundred forty-two million, six hundred seventy-three thousand, five hundred eighty-three".