642513427811 has 2 divisors, whose sum is σ = 642513427812. Its totient is φ = 642513427810.

The previous prime is 642513427807. The next prime is 642513427813. The reversal of 642513427811 is 118724315246.

It is a happy number.

642513427811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642513427811 - 2² = 642513427807 is a prime.

It is a super-2 number, since 2×642513427811² (a number of 24 digits) contains 22 as substring.

Together with 642513427813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (642513427813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321256713905 + 321256713906.

It is an arithmetic number, because the mean of its divisors is an integer number (321256713906).

Almost surely, 2^642513427811 is an apocalyptic number.

642513427811 is a deficient number, since it is larger than the sum of its proper divisors (1).

642513427811 is an equidigital number, since it uses as much as digits as its factorization.

642513427811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 44.

The spelling of 642513427811 in words is "six hundred forty-two billion, five hundred thirteen million, four hundred twenty-seven thousand, eight hundred eleven".