642558612799 has 2 divisors, whose sum is σ = 642558612800. Its totient is φ = 642558612798.

The previous prime is 642558612719. The next prime is 642558612827. The reversal of 642558612799 is 997216855246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642558612799 - 2²³ = 642550224191 is a prime.

It is a super-2 number, since 2×642558612799² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 642558612799.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642558612719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321279306399 + 321279306400.

It is an arithmetic number, because the mean of its divisors is an integer number (321279306400).

Almost surely, 2^642558612799 is an apocalyptic number.

642558612799 is a deficient number, since it is larger than the sum of its proper divisors (1).

642558612799 is an equidigital number, since it uses as much as digits as its factorization.

642558612799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65318400, while the sum is 64.

The spelling of 642558612799 in words is "six hundred forty-two billion, five hundred fifty-eight million, six hundred twelve thousand, seven hundred ninety-nine".