16560375421 has 2 divisors, whose sum is σ = 16560375422. Its totient is φ = 16560375420.

The previous prime is 16560375373. The next prime is 16560375431. The reversal of 16560375421 is 12457306561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14131265625 + 2429109796 = 118875^2 + 49286^2 .

It is a cyclic number.

It is not a de Polignac number, because 16560375421 - 2¹⁵ = 16560342653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16560375431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8280187710 + 8280187711.

It is an arithmetic number, because the mean of its divisors is an integer number (8280187711).

Almost surely, 2^16560375421 is an apocalyptic number.

It is an amenable number.

16560375421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16560375421 is an equidigital number, since it uses as much as digits as its factorization.

16560375421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 16560375421 in words is "sixteen billion, five hundred sixty million, three hundred seventy-five thousand, four hundred twenty-one".