66543105642 has 64 divisors (see below), whose sum is σ = 150915072000. Its totient is φ = 19390995648.

The previous prime is 66543105619. The next prime is 66543105649. The reversal of 66543105642 is 24650134566.

It is a junction number, because it is equal to n+sod(n) for n = 66543105594 and 66543105603.

It is not an unprimeable number, because it can be changed into a prime (66543105649) 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, 6870159 + ... + 6879837.

It is an arithmetic number, because the mean of its divisors is an integer number (2358048000).

Almost surely, 2^66543105642 is an apocalyptic number.

66543105642 is an abundant number, since it is smaller than the sum of its proper divisors (84371966358).

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

66543105642 is a wasteful number, since it uses less digits than its factorization.

66543105642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14355.

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 66543105642 in words is "sixty-six billion, five hundred forty-three million, one hundred five thousand, six hundred forty-two".