66824267811841 has 4 divisors (see below), whose sum is σ = 70341334538800. Its totient is φ = 63307201084884.

The previous prime is 66824267811793. The next prime is 66824267811883. The reversal of 66824267811841 is 14811876242866.

It is a happy number.

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 not a de Polignac number, because 66824267811841 - 2⁷ = 66824267811713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66824267815841) 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, 1758533363451 + ... + 1758533363488.

It is an arithmetic number, because the mean of its divisors is an integer number (17585333634700).

Almost surely, 2^{66824267811841} is an apocalyptic number.

It is an amenable number.

66824267811841 is a deficient number, since it is larger than the sum of its proper divisors (3517066726959).

66824267811841 is a wasteful number, since it uses less digits than its factorization.

66824267811841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517066726958.

The product of its digits is 49545216, while the sum is 64.

The spelling of 66824267811841 in words is "sixty-six trillion, eight hundred twenty-four billion, two hundred sixty-seven million, eight hundred eleven thousand, eight hundred forty-one".