642606067 has 2 divisors, whose sum is σ = 642606068. Its totient is φ = 642606066.

The previous prime is 642606053. The next prime is 642606073. The reversal of 642606067 is 760606246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642606067 - 2¹¹ = 642604019 is a prime.

It is not a weakly prime, because it can be changed into another prime (642603067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321303033 + 321303034.

It is an arithmetic number, because the mean of its divisors is an integer number (321303034).

Almost surely, 2^642606067 is an apocalyptic number.

642606067 is a deficient number, since it is larger than the sum of its proper divisors (1).

642606067 is an equidigital number, since it uses as much as digits as its factorization.

642606067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 642606067 is about 25349.6758756399. The cubic root of 642606067 is about 862.9420004910.

The spelling of 642606067 in words is "six hundred forty-two million, six hundred six thousand, sixty-seven".