66538271845 has 8 divisors (see below), whose sum is σ = 81037656864. Its totient is φ = 52436130384.

The previous prime is 66538271837. The next prime is 66538271861. The reversal of 66538271845 is 54817283566.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66538271845 - 2³ = 66538271837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99310519 + ... + 99311188.

It is an arithmetic number, because the mean of its divisors is an integer number (10129707108).

Almost surely, 2^66538271845 is an apocalyptic number.

It is an amenable number.

66538271845 is a deficient number, since it is larger than the sum of its proper divisors (14499385019).

66538271845 is a wasteful number, since it uses less digits than its factorization.

66538271845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198621779.

The product of its digits is 9676800, while the sum is 55.

The spelling of 66538271845 in words is "sixty-six billion, five hundred thirty-eight million, two hundred seventy-one thousand, eight hundred forty-five".