642538454305 has 32 divisors (see below), whose sum is σ = 929342792448. Its totient is φ = 420690124800.

The previous prime is 642538454219. The next prime is 642538454309. The reversal of 642538454305 is 503454835246.

It is not a de Polignac number, because 642538454305 - 2¹⁹ = 642537930017 is a prime.

It is a super-3 number, since 3×642538454305³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642538454309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14917776 + ... + 14960785.

It is an arithmetic number, because the mean of its divisors is an integer number (29041962264).

Almost surely, 2^642538454305 is an apocalyptic number.

It is an amenable number.

642538454305 is a deficient number, since it is larger than the sum of its proper divisors (286804338143).

642538454305 is a wasteful number, since it uses less digits than its factorization.

642538454305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29878617.

The product of its (nonzero) digits is 6912000, while the sum is 49.

The spelling of 642538454305 in words is "six hundred forty-two billion, five hundred thirty-eight million, four hundred fifty-four thousand, three hundred five".