642454023560 has 16 divisors (see below), whose sum is σ = 1445521553100. Its totient is φ = 256981609408.

The previous prime is 642454023557. The next prime is 642454023569. The reversal of 642454023560 is 65320454246.

642454023560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 605150191396 + 37303832164 = 777914^2 + 193142^2 .

It is not an unprimeable number, because it can be changed into a prime (642454023569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8030675255 + ... + 8030675334.

Almost surely, 2^642454023560 is an apocalyptic number.

It is an amenable number.

642454023560 is an abundant number, since it is smaller than the sum of its proper divisors (803067529540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642454023560 is a wasteful number, since it uses less digits than its factorization.

642454023560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16061350600 (or 16061350596 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 41.

The spelling of 642454023560 in words is "six hundred forty-two billion, four hundred fifty-four million, twenty-three thousand, five hundred sixty".