66323804261 has 16 divisors (see below), whose sum is σ = 78154335168. Its totient is φ = 55488153600.

The previous prime is 66323804207. The next prime is 66323804293. The reversal of 66323804261 is 16240832366.

It is not a de Polignac number, because 66323804261 - 2¹⁴ = 66323787877 is a prime.

It is a super-2 number, since 2×66323804261² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66323804161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 653276 + ... + 747941.

It is an arithmetic number, because the mean of its divisors is an integer number (4884645948).

Almost surely, 2^66323804261 is an apocalyptic number.

It is an amenable number.

66323804261 is a deficient number, since it is larger than the sum of its proper divisors (11830530907).

66323804261 is a wasteful number, since it uses less digits than its factorization.

66323804261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401572.

The product of its (nonzero) digits is 248832, while the sum is 41.

The spelling of 66323804261 in words is "sixty-six billion, three hundred twenty-three million, eight hundred four thousand, two hundred sixty-one".