642418981061 has 32 divisors (see below), whose sum is σ = 794558177280. Its totient is φ = 510651691200.

The previous prime is 642418981051. The next prime is 642418981063. The reversal of 642418981061 is 160189814246.

It is a happy number.

642418981061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642418981061 - 2³⁴ = 625239111877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642418981063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33961196 + ... + 33980106.

It is an arithmetic number, because the mean of its divisors is an integer number (24829943040).

Almost surely, 2^642418981061 is an apocalyptic number.

It is an amenable number.

642418981061 is a deficient number, since it is larger than the sum of its proper divisors (152139196219).

642418981061 is a wasteful number, since it uses less digits than its factorization.

642418981061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31457.

The product of its (nonzero) digits is 663552, while the sum is 50.

The spelling of 642418981061 in words is "six hundred forty-two billion, four hundred eighteen million, nine hundred eighty-one thousand, sixty-one".