66542244642 has 24 divisors (see below), whose sum is σ = 144180681840. Its totient is φ = 22179853080.

The previous prime is 66542244617. The next prime is 66542244647. The reversal of 66542244642 is 24644224566.

66542244642 is a `hidden beast` number, since 6 + 6 + 542 + 2 + 44 + 64 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (66542244647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 505917 + ... + 623727.

It is an arithmetic number, because the mean of its divisors is an integer number (6007528410).

Almost surely, 2^66542244642 is an apocalyptic number.

66542244642 is an abundant number, since it is smaller than the sum of its proper divisors (77638437198).

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

66542244642 is a wasteful number, since it uses less digits than its factorization.

66542244642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149198 (or 149195 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 45.

The spelling of 66542244642 in words is "sixty-six billion, five hundred forty-two million, two hundred forty-four thousand, six hundred forty-two".