66542201472 has 32 divisors (see below), whose sum is σ = 176752723680. Its totient is φ = 22180733696.

The previous prime is 66542201461. The next prime is 66542201497. The reversal of 66542201472 is 27410224566.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 66542201472.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 86643108 + ... + 86643875.

It is an arithmetic number, because the mean of its divisors is an integer number (5523522615).

Almost surely, 2^66542201472 is an apocalyptic number.

It is an amenable number.

66542201472 is an abundant number, since it is smaller than the sum of its proper divisors (110210522208).

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

66542201472 is a wasteful number, since it uses less digits than its factorization.

66542201472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173287000 (or 173286988 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 66542201472 in words is "sixty-six billion, five hundred forty-two million, two hundred one thousand, four hundred seventy-two".