642617683 has 2 divisors, whose sum is σ = 642617684. Its totient is φ = 642617682.

The previous prime is 642617611. The next prime is 642617687. The reversal of 642617683 is 386716246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642617683 - 2¹³ = 642609491 is a prime.

It is not a weakly prime, because it can be changed into another prime (642617687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321308841 + 321308842.

It is an arithmetic number, because the mean of its divisors is an integer number (321308842).

Almost surely, 2^642617683 is an apocalyptic number.

642617683 is a deficient number, since it is larger than the sum of its proper divisors (1).

642617683 is an equidigital number, since it uses as much as digits as its factorization.

642617683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 43.

The square root of 642617683 is about 25349.9049899600. The cubic root of 642617683 is about 862.9472000860.

The spelling of 642617683 in words is "six hundred forty-two million, six hundred seventeen thousand, six hundred eighty-three".