16071374457521 has 2 divisors, whose sum is σ = 16071374457522. Its totient is φ = 16071374457520.

The previous prime is 16071374457373. The next prime is 16071374457527. The reversal of 16071374457521 is 12575447317061.

16071374457521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8963071957921 + 7108302499600 = 2993839^2 + 2666140^2 .

It is an emirp because it is prime and its reverse (12575447317061) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16071374457521 is a prime.

It is not a weakly prime, because it can be changed into another prime (16071374457527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8035687228760 + 8035687228761.

It is an arithmetic number, because the mean of its divisors is an integer number (8035687228761).

Almost surely, 2^{16071374457521} is an apocalyptic number.

It is an amenable number.

16071374457521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16071374457521 is an equidigital number, since it uses as much as digits as its factorization.

16071374457521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4939200, while the sum is 53.

The spelling of 16071374457521 in words is "sixteen trillion, seventy-one billion, three hundred seventy-four million, four hundred fifty-seven thousand, five hundred twenty-one".