642216011 has 2 divisors, whose sum is σ = 642216012. Its totient is φ = 642216010.

The previous prime is 642216007. The next prime is 642216041. The reversal of 642216011 is 110612246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642216011 - 2² = 642216007 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (642216041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321108005 + 321108006.

It is an arithmetic number, because the mean of its divisors is an integer number (321108006).

Almost surely, 2^642216011 is an apocalyptic number.

642216011 is a deficient number, since it is larger than the sum of its proper divisors (1).

642216011 is an equidigital number, since it uses as much as digits as its factorization.

642216011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 642216011 is about 25341.9811972150. The cubic root of 642216011 is about 862.7673658541.

Adding to 642216011 its reverse (110612246), we get a palindrome (752828257).

The spelling of 642216011 in words is "six hundred forty-two million, two hundred sixteen thousand, eleven".