66145233504621 has 16 divisors (see below), whose sum is σ = 91235089229760. Its totient is φ = 42576109537920.

The previous prime is 66145233504589. The next prime is 66145233504709. The reversal of 66145233504621 is 12640533254166.

It is not a de Polignac number, because 66145233504621 - 2⁵ = 66145233504589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66145233505621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32288406 + ... + 34275816.

It is an arithmetic number, because the mean of its divisors is an integer number (5702193076860).

Almost surely, 2^{66145233504621} is an apocalyptic number.

It is an amenable number.

66145233504621 is a deficient number, since it is larger than the sum of its proper divisors (25089855725139).

66145233504621 is a wasteful number, since it uses less digits than its factorization.

66145233504621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369996.

The product of its (nonzero) digits is 3110400, while the sum is 48.

Adding to 66145233504621 its reverse (12640533254166), we get a palindrome (78785766758787).

The spelling of 66145233504621 in words is "sixty-six trillion, one hundred forty-five billion, two hundred thirty-three million, five hundred four thousand, six hundred twenty-one".