66109873562 has 4 divisors (see below), whose sum is σ = 99164810346. Its totient is φ = 33054936780.

The previous prime is 66109873561. The next prime is 66109873619. The reversal of 66109873562 is 26537890166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 40413462961 + 25696410601 = 201031^2 + 160301^2 .

It is not an unprimeable number, because it can be changed into a prime (66109873561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16527468389 + ... + 16527468392.

Almost surely, 2^66109873562 is an apocalyptic number.

66109873562 is a deficient number, since it is larger than the sum of its proper divisors (33054936784).

66109873562 is a wasteful number, since it uses less digits than its factorization.

66109873562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33054936783.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 66109873562 in words is "sixty-six billion, one hundred nine million, eight hundred seventy-three thousand, five hundred sixty-two".