642710623 has 2 divisors, whose sum is σ = 642710624. Its totient is φ = 642710622.

The previous prime is 642710617. The next prime is 642710639. The reversal of 642710623 is 326017246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642710623 - 2⁵ = 642710591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642710023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321355311 + 321355312.

It is an arithmetic number, because the mean of its divisors is an integer number (321355312).

Almost surely, 2^642710623 is an apocalyptic number.

642710623 is a deficient number, since it is larger than the sum of its proper divisors (1).

642710623 is an equidigital number, since it uses as much as digits as its factorization.

642710623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 642710623 is about 25351.7380666494. The cubic root of 642710623 is about 862.9887999613.

Adding to 642710623 its reverse (326017246), we get a palindrome (968727869).

The spelling of 642710623 in words is "six hundred forty-two million, seven hundred ten thousand, six hundred twenty-three".