66571156121 has 8 divisors (see below), whose sum is σ = 70087072320. Its totient is φ = 63056457072.

The previous prime is 66571156117. The next prime is 66571156133. The reversal of 66571156121 is 12165117566.

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 66571156121 - 2² = 66571156117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66571152121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190925 + ... + 411818.

It is an arithmetic number, because the mean of its divisors is an integer number (8760884040).

Almost surely, 2^66571156121 is an apocalyptic number.

It is an amenable number.

66571156121 is a deficient number, since it is larger than the sum of its proper divisors (3515916199).

66571156121 is a wasteful number, since it uses less digits than its factorization.

66571156121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608575.

The product of its digits is 75600, while the sum is 41.

The spelling of 66571156121 in words is "sixty-six billion, five hundred seventy-one million, one hundred fifty-six thousand, one hundred twenty-one".