66197558863 has 4 divisors (see below), whose sum is σ = 67282764808. Its totient is φ = 65112352920.

The previous prime is 66197558849. The next prime is 66197558879. The reversal of 66197558863 is 36885579166.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66197558863 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66197558795 and 66197558804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66197558803) 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, 542602881 + ... + 542603002.

It is an arithmetic number, because the mean of its divisors is an integer number (16820691202).

Almost surely, 2^66197558863 is an apocalyptic number.

66197558863 is a deficient number, since it is larger than the sum of its proper divisors (1085205945).

66197558863 is a wasteful number, since it uses less digits than its factorization.

66197558863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085205944.

The product of its digits is 65318400, while the sum is 64.

The spelling of 66197558863 in words is "sixty-six billion, one hundred ninety-seven million, five hundred fifty-eight thousand, eight hundred sixty-three".