66121340036433 has 24 divisors (see below), whose sum is σ = 98232571629024. Its totient is φ = 39524586805440.

The previous prime is 66121340036429. The next prime is 66121340036447. The reversal of 66121340036433 is 33463004312166.

It is not a de Polignac number, because 66121340036433 - 2² = 66121340036429 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66121340036033) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1247593035 + ... + 1247646032.

It is an arithmetic number, because the mean of its divisors is an integer number (4093023817876).

Almost surely, 2^{66121340036433} is an apocalyptic number.

It is an amenable number.

66121340036433 is a deficient number, since it is larger than the sum of its proper divisors (32111231592591).

66121340036433 is a wasteful number, since it uses less digits than its factorization.

66121340036433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495239165 (or 2495239154 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 42.

Adding to 66121340036433 its reverse (33463004312166), we get a palindrome (99584344348599).

The spelling of 66121340036433 in words is "sixty-six trillion, one hundred twenty-one billion, three hundred forty million, thirty-six thousand, four hundred thirty-three".