642236780045 has 16 divisors (see below), whose sum is σ = 880804696320. Its totient is φ = 440379521664.

The previous prime is 642236779997. The next prime is 642236780047. The reversal of 642236780045 is 540087632246.

It is a cyclic number.

It is not a de Polignac number, because 642236780045 - 2¹⁴ = 642236763661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642236780047) 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 in 15 ways as a sum of consecutive naturals, for example, 1265969 + ... + 1699161.

It is an arithmetic number, because the mean of its divisors is an integer number (55050293520).

Almost surely, 2^642236780045 is an apocalyptic number.

It is an amenable number.

642236780045 is a deficient number, since it is larger than the sum of its proper divisors (238567916275).

642236780045 is a wasteful number, since it uses less digits than its factorization.

642236780045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475564.

The product of its (nonzero) digits is 1935360, while the sum is 47.

The spelling of 642236780045 in words is "six hundred forty-two billion, two hundred thirty-six million, seven hundred eighty thousand, forty-five".