642537030917 has 2 divisors, whose sum is σ = 642537030918. Its totient is φ = 642537030916.

The previous prime is 642537030887. The next prime is 642537030943. The reversal of 642537030917 is 719030735246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 640897914721 + 1639116196 = 800561^2 + 40486^2 .

It is a cyclic number.

It is not a de Polignac number, because 642537030917 - 2⁸ = 642537030661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642537080917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321268515458 + 321268515459.

It is an arithmetic number, because the mean of its divisors is an integer number (321268515459).

Almost surely, 2^642537030917 is an apocalyptic number.

It is an amenable number.

642537030917 is a deficient number, since it is larger than the sum of its proper divisors (1).

642537030917 is an equidigital number, since it uses as much as digits as its factorization.

642537030917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 47.

The spelling of 642537030917 in words is "six hundred forty-two billion, five hundred thirty-seven million, thirty thousand, nine hundred seventeen".