66320144451 has 12 divisors (see below), whose sum is σ = 104504470200. Its totient is φ = 40194026880.

The previous prime is 66320144447. The next prime is 66320144453. The reversal of 66320144451 is 15444102366.

66320144451 is a `hidden beast` number, since 6 + 6 + 3 + 201 + 4 + 445 + 1 = 666.

It is not a de Polignac number, because 66320144451 - 2² = 66320144447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66320144453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 334950126 + ... + 334950323.

It is an arithmetic number, because the mean of its divisors is an integer number (8708705850).

Almost surely, 2^66320144451 is an apocalyptic number.

66320144451 is a deficient number, since it is larger than the sum of its proper divisors (38184325749).

66320144451 is a wasteful number, since it uses less digits than its factorization.

66320144451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669900466 (or 669900463 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 66320144451 in words is "sixty-six billion, three hundred twenty million, one hundred forty-four thousand, four hundred fifty-one".