642116107 has 2 divisors, whose sum is σ = 642116108. Its totient is φ = 642116106.

The previous prime is 642116053. The next prime is 642116131. The reversal of 642116107 is 701611246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642116107 - 2⁷ = 642115979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (642116177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321058053 + 321058054.

It is an arithmetic number, because the mean of its divisors is an integer number (321058054).

Almost surely, 2^642116107 is an apocalyptic number.

642116107 is a deficient number, since it is larger than the sum of its proper divisors (1).

642116107 is an equidigital number, since it uses as much as digits as its factorization.

642116107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 642116107 is about 25340.0100039444. The cubic root of 642116107 is about 862.7226257774.

The spelling of 642116107 in words is "six hundred forty-two million, one hundred sixteen thousand, one hundred seven".