66450921447523 has 8 divisors (see below), whose sum is σ = 66986399416320. Its totient is φ = 65915634765960.

The previous prime is 66450921447437. The next prime is 66450921447551. The reversal of 66450921447523 is 32574412905466.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66450921447523 is a prime.

It is a super-2 number, since 2×66450921447523² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66450921448523) 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, 47124193 + ... + 48513826.

It is an arithmetic number, because the mean of its divisors is an integer number (8373299927040).

Almost surely, 2^{66450921447523} is an apocalyptic number.

66450921447523 is a deficient number, since it is larger than the sum of its proper divisors (535477968797).

66450921447523 is a wasteful number, since it uses less digits than its factorization.

66450921447523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95643617.

The product of its (nonzero) digits is 43545600, while the sum is 58.

The spelling of 66450921447523 in words is "sixty-six trillion, four hundred fifty billion, nine hundred twenty-one million, four hundred forty-seven thousand, five hundred twenty-three".