66213354123 has 64 divisors (see below), whose sum is σ = 113520384000. Its totient is φ = 37362280320.

The previous prime is 66213354089. The next prime is 66213354127. The reversal of 66213354123 is 32145331266.

66213354123 is a `hidden beast` number, since 6 + 62 + 1 + 33 + 541 + 23 = 666.

It is not a de Polignac number, because 66213354123 - 2²⁰ = 66212305547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66213354127) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4865058 + ... + 4878648.

It is an arithmetic number, because the mean of its divisors is an integer number (1773756000).

Almost surely, 2^66213354123 is an apocalyptic number.

66213354123 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

66213354123 is a deficient number, since it is larger than the sum of its proper divisors (47307029877).

66213354123 is a wasteful number, since it uses less digits than its factorization.

66213354123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13929 (or 13923 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

Adding to 66213354123 its reverse (32145331266), we get a palindrome (98358685389).

The spelling of 66213354123 in words is "sixty-six billion, two hundred thirteen million, three hundred fifty-four thousand, one hundred twenty-three".