66183861097 has 4 divisors (see below), whose sum is σ = 66293984596. Its totient is φ = 66073737600.

The previous prime is 66183861077. The next prime is 66183861113. The reversal of 66183861097 is 79016838166.

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

It can be written as a sum of positive squares in 2 ways, for example, as 43783051536 + 22400809561 = 209244^2 + 149669^2 .

It is a cyclic number.

It is not a de Polignac number, because 66183861097 - 2²⁷ = 66049643369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66183861017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55060848 + ... + 55062049.

It is an arithmetic number, because the mean of its divisors is an integer number (16573496149).

Almost surely, 2^66183861097 is an apocalyptic number.

It is an amenable number.

66183861097 is a deficient number, since it is larger than the sum of its proper divisors (110123499).

66183861097 is a wasteful number, since it uses less digits than its factorization.

66183861097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110123498.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 66183861097 in words is "sixty-six billion, one hundred eighty-three million, eight hundred sixty-one thousand, ninety-seven".