66667744441 has 4 divisors (see below), whose sum is σ = 66691197072. Its totient is φ = 66644291812.

The previous prime is 66667744433. The next prime is 66667744453. The reversal of 66667744441 is 14444776666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66667744441 - 2³ = 66667744433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66667744411) 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 3 ways as a sum of consecutive naturals, for example, 11722051 + ... + 11727736.

It is an arithmetic number, because the mean of its divisors is an integer number (16672799268).

Almost surely, 2^66667744441 is an apocalyptic number.

It is an amenable number.

66667744441 is a deficient number, since it is larger than the sum of its proper divisors (23452631).

66667744441 is a wasteful number, since it uses less digits than its factorization.

66667744441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23452630.

The product of its digits is 16257024, while the sum is 55.

The spelling of 66667744441 in words is "sixty-six billion, six hundred sixty-seven million, seven hundred forty-four thousand, four hundred forty-one".