642454100009 has 2 divisors, whose sum is σ = 642454100010. Its totient is φ = 642454100008.

The previous prime is 642454099993. The next prime is 642454100107. The reversal of 642454100009 is 900001454246.

642454100009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 545404405225 + 97049694784 = 738515^2 + 311528^2 .

It is a cyclic number.

It is not a de Polignac number, because 642454100009 - 2⁴ = 642454099993 is a prime.

It is not a weakly prime, because it can be changed into another prime (642454100209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321227050004 + 321227050005.

It is an arithmetic number, because the mean of its divisors is an integer number (321227050005).

Almost surely, 2^642454100009 is an apocalyptic number.

It is an amenable number.

642454100009 is a deficient number, since it is larger than the sum of its proper divisors (1).

642454100009 is an equidigital number, since it uses as much as digits as its factorization.

642454100009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 642454100009 in words is "six hundred forty-two billion, four hundred fifty-four million, one hundred thousand, nine".