74011721857 has 2 divisors, whose sum is σ = 74011721858. Its totient is φ = 74011721856.

The previous prime is 74011721813. The next prime is 74011721863. The reversal of 74011721857 is 75812711047.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47482153216 + 26529568641 = 217904^2 + 162879^2 .

It is an emirp because it is prime and its reverse (75812711047) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74011721857 - 2²³ = 74003333249 is a prime.

It is not a weakly prime, because it can be changed into another prime (74011721887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37005860928 + 37005860929.

It is an arithmetic number, because the mean of its divisors is an integer number (37005860929).

Almost surely, 2^74011721857 is an apocalyptic number.

It is an amenable number.

74011721857 is a deficient number, since it is larger than the sum of its proper divisors (1).

74011721857 is an equidigital number, since it uses as much as digits as its factorization.

74011721857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 109760, while the sum is 43.

The spelling of 74011721857 in words is "seventy-four billion, eleven million, seven hundred twenty-one thousand, eight hundred fifty-seven".