74011721813 has 2 divisors, whose sum is σ = 74011721814. Its totient is φ = 74011721812.

The previous prime is 74011721783. The next prime is 74011721857. The reversal of 74011721813 is 31812711047.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62648588209 + 11363133604 = 250297^2 + 106598^2 .

It is a cyclic number.

It is not a de Polignac number, because 74011721813 - 2⁸ = 74011721557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74011721863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37005860906 + 37005860907.

It is an arithmetic number, because the mean of its divisors is an integer number (37005860907).

Almost surely, 2^74011721813 is an apocalyptic number.

It is an amenable number.

74011721813 is a deficient number, since it is larger than the sum of its proper divisors (1).

74011721813 is an equidigital number, since it uses as much as digits as its factorization.

74011721813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 35.

The spelling of 74011721813 in words is "seventy-four billion, eleven million, seven hundred twenty-one thousand, eight hundred thirteen".