66555871297 has 4 divisors (see below), whose sum is σ = 66560115760. Its totient is φ = 66551626836.

The previous prime is 66555871289. The next prime is 66555871337. The reversal of 66555871297 is 79217855566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66555871297 - 2³ = 66555871289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66525871297) 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, 2098623 + ... + 2130100.

It is an arithmetic number, because the mean of its divisors is an integer number (16640028940).

Almost surely, 2^66555871297 is an apocalyptic number.

It is an amenable number.

66555871297 is a deficient number, since it is larger than the sum of its proper divisors (4244463).

66555871297 is a wasteful number, since it uses less digits than its factorization.

66555871297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4244462.

The product of its digits is 31752000, while the sum is 61.

The spelling of 66555871297 in words is "sixty-six billion, five hundred fifty-five million, eight hundred seventy-one thousand, two hundred ninety-seven".