66450921448523 has 2 divisors, whose sum is σ = 66450921448524. Its totient is φ = 66450921448522.

The previous prime is 66450921448489. The next prime is 66450921448579. The reversal of 66450921448523 is 32584412905466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66450921448523 - 2¹⁸ = 66450921186379 is a prime.

It is a super-2 number, since 2×66450921448523² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66450921448123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33225460724261 + 33225460724262.

It is an arithmetic number, because the mean of its divisors is an integer number (33225460724262).

Almost surely, 2^{66450921448523} is an apocalyptic number.

66450921448523 is a deficient number, since it is larger than the sum of its proper divisors (1).

66450921448523 is an equidigital number, since it uses as much as digits as its factorization.

66450921448523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49766400, while the sum is 59.

The spelling of 66450921448523 in words is "sixty-six trillion, four hundred fifty billion, nine hundred twenty-one million, four hundred forty-eight thousand, five hundred twenty-three".