16565028461 has 2 divisors, whose sum is σ = 16565028462. Its totient is φ = 16565028460.

The previous prime is 16565028409. The next prime is 16565028509. The reversal of 16565028461 is 16482056561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11482194025 + 5082834436 = 107155^2 + 71294^2 .

It is a cyclic number.

It is not a de Polignac number, because 16565028461 - 2⁶ = 16565028397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16565028401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8282514230 + 8282514231.

It is an arithmetic number, because the mean of its divisors is an integer number (8282514231).

Almost surely, 2^16565028461 is an apocalyptic number.

It is an amenable number.

16565028461 is a deficient number, since it is larger than the sum of its proper divisors (1).

16565028461 is an equidigital number, since it uses as much as digits as its factorization.

16565028461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 16565028461 in words is "sixteen billion, five hundred sixty-five million, twenty-eight thousand, four hundred sixty-one".