66382758523 has 4 divisors (see below), whose sum is σ = 67471000528. Its totient is φ = 65294516520.

The previous prime is 66382758509. The next prime is 66382758529. The reversal of 66382758523 is 32585728366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32585728366 = 2 ⋅16292864183.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66382758523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66382758529) 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, 544120911 + ... + 544121032.

It is an arithmetic number, because the mean of its divisors is an integer number (16867750132).

Almost surely, 2^66382758523 is an apocalyptic number.

66382758523 is a deficient number, since it is larger than the sum of its proper divisors (1088242005).

66382758523 is a wasteful number, since it uses less digits than its factorization.

66382758523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088242004.

The product of its digits is 14515200, while the sum is 55.

The spelling of 66382758523 in words is "sixty-six billion, three hundred eighty-two million, seven hundred fifty-eight thousand, five hundred twenty-three".