74736691043821 has 2 divisors, whose sum is σ = 74736691043822. Its totient is φ = 74736691043820.

The previous prime is 74736691043809. The next prime is 74736691043969. The reversal of 74736691043821 is 12834019663747.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71464806986596 + 3271884057225 = 8453686^2 + 1808835^2 .

It is a cyclic number.

It is not a de Polignac number, because 74736691043821 - 2⁵ = 74736691043789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74736691043821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74736691041821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37368345521910 + 37368345521911.

It is an arithmetic number, because the mean of its divisors is an integer number (37368345521911).

Almost surely, 2^{74736691043821} is an apocalyptic number.

It is an amenable number.

74736691043821 is a deficient number, since it is larger than the sum of its proper divisors (1).

74736691043821 is an equidigital number, since it uses as much as digits as its factorization.

74736691043821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36578304, while the sum is 61.

The spelling of 74736691043821 in words is "seventy-four trillion, seven hundred thirty-six billion, six hundred ninety-one million, forty-three thousand, eight hundred twenty-one".