642999268913 has 2 divisors, whose sum is σ = 642999268914. Its totient is φ = 642999268912.

The previous prime is 642999268799. The next prime is 642999268939. The reversal of 642999268913 is 319862999246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391860976144 + 251138292769 = 625988^2 + 501137^2 .

It is a cyclic number.

It is not a de Polignac number, because 642999268913 - 2¹⁴ = 642999252529 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (642999268963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321499634456 + 321499634457.

It is an arithmetic number, because the mean of its divisors is an integer number (321499634457).

Almost surely, 2^642999268913 is an apocalyptic number.

It is an amenable number.

642999268913 is a deficient number, since it is larger than the sum of its proper divisors (1).

642999268913 is an equidigital number, since it uses as much as digits as its factorization.

642999268913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90699264, while the sum is 68.

The spelling of 642999268913 in words is "six hundred forty-two billion, nine hundred ninety-nine million, two hundred sixty-eight thousand, nine hundred thirteen".