66450521064023 has 4 divisors (see below), whose sum is σ = 66454873068360. Its totient is φ = 66446169059688.

The previous prime is 66450521064013. The next prime is 66450521064061. The reversal of 66450521064023 is 32046012505466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66450521064023 - 2⁶ = 66450521063959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66450521064013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2175979265 + ... + 2176009802.

It is an arithmetic number, because the mean of its divisors is an integer number (16613718267090).

Almost surely, 2^{66450521064023} is an apocalyptic number.

66450521064023 is a deficient number, since it is larger than the sum of its proper divisors (4352004337).

66450521064023 is a wasteful number, since it uses less digits than its factorization.

66450521064023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4352004336.

The product of its (nonzero) digits is 1036800, while the sum is 44.

Adding to 66450521064023 its reverse (32046012505466), we get a palindrome (98496533569489).

The spelling of 66450521064023 in words is "sixty-six trillion, four hundred fifty billion, five hundred twenty-one million, sixty-four thousand, twenty-three".