66566544373 has 32 divisors (see below), whose sum is σ = 81579294720. Its totient is φ = 53110512000.

The previous prime is 66566544361. The next prime is 66566544391. The reversal of 66566544373 is 37344566566.

It is a happy number.

It is not a de Polignac number, because 66566544373 - 2¹³ = 66566536181 is a prime.

It is a super-2 number, since 2×66566544373² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66566544313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 578998 + ... + 684376.

It is an arithmetic number, because the mean of its divisors is an integer number (2549352960).

Almost surely, 2^66566544373 is an apocalyptic number.

It is an amenable number.

66566544373 is a deficient number, since it is larger than the sum of its proper divisors (15012750347).

66566544373 is a wasteful number, since it uses less digits than its factorization.

66566544373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105529.

The product of its digits is 32659200, while the sum is 55.

The spelling of 66566544373 in words is "sixty-six billion, five hundred sixty-six million, five hundred forty-four thousand, three hundred seventy-three".