642454550407 has 2 divisors, whose sum is σ = 642454550408. Its totient is φ = 642454550406.

The previous prime is 642454550383. The next prime is 642454550417. The reversal of 642454550407 is 704055454246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642454550407 - 2⁷ = 642454550279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642454550417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321227275203 + 321227275204.

It is an arithmetic number, because the mean of its divisors is an integer number (321227275204).

Almost surely, 2^642454550407 is an apocalyptic number.

642454550407 is a deficient number, since it is larger than the sum of its proper divisors (1).

642454550407 is an equidigital number, since it uses as much as digits as its factorization.

642454550407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688000, while the sum is 46.

The spelling of 642454550407 in words is "six hundred forty-two billion, four hundred fifty-four million, five hundred fifty thousand, four hundred seven".