642999268799 has 2 divisors, whose sum is σ = 642999268800. Its totient is φ = 642999268798.

The previous prime is 642999268771. The next prime is 642999268913. The reversal of 642999268799 is 997862999246.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642999268799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642929268799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321499634399 + 321499634400.

It is an arithmetic number, because the mean of its divisors is an integer number (321499634400).

Almost surely, 2^642999268799 is an apocalyptic number.

642999268799 is a deficient number, since it is larger than the sum of its proper divisors (1).

642999268799 is an equidigital number, since it uses as much as digits as its factorization.

642999268799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1904684544, while the sum is 80.

The spelling of 642999268799 in words is "six hundred forty-two billion, nine hundred ninety-nine million, two hundred sixty-eight thousand, seven hundred ninety-nine".