642518733548 has 48 divisors (see below), whose sum is σ = 1152556392960. Its totient is φ = 313324963776.

The previous prime is 642518733541. The next prime is 642518733583. The reversal of 642518733548 is 845337815246.

642518733548 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 642518733493 and 642518733502.

It is not an unprimeable number, because it can be changed into a prime (642518733541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13647986 + ... + 13694982.

It is an arithmetic number, because the mean of its divisors is an integer number (24011591520).

Almost surely, 2^642518733548 is an apocalyptic number.

It is an amenable number.

642518733548 is a deficient number, since it is larger than the sum of its proper divisors (510037659412).

642518733548 is a wasteful number, since it uses less digits than its factorization.

642518733548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47574 (or 47572 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 56.

The spelling of 642518733548 in words is "six hundred forty-two billion, five hundred eighteen million, seven hundred thirty-three thousand, five hundred forty-eight".