74844693821 has 2 divisors, whose sum is σ = 74844693822. Its totient is φ = 74844693820.

The previous prime is 74844693797. The next prime is 74844693841. The reversal of 74844693821 is 12839644847.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57737361796 + 17107332025 = 240286^2 + 130795^2 .

It is an emirp because it is prime and its reverse (12839644847) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74844693821 - 2¹⁴ = 74844677437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74844693841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37422346910 + 37422346911.

It is an arithmetic number, because the mean of its divisors is an integer number (37422346911).

Almost surely, 2^74844693821 is an apocalyptic number.

It is an amenable number.

74844693821 is a deficient number, since it is larger than the sum of its proper divisors (1).

74844693821 is an equidigital number, since it uses as much as digits as its factorization.

74844693821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728, while the sum is 56.

The spelling of 74844693821 in words is "seventy-four billion, eight hundred forty-four million, six hundred ninety-three thousand, eight hundred twenty-one".