16564746469 has 2 divisors, whose sum is σ = 16564746470. Its totient is φ = 16564746468.

The previous prime is 16564746439. The next prime is 16564746547. The reversal of 16564746469 is 96464746561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14712477025 + 1852269444 = 121295^2 + 43038^2 .

It is a cyclic number.

It is not a de Polignac number, because 16564746469 - 2¹³ = 16564738277 is a prime.

It is a super-2 number, since 2×16564746469² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16564746439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8282373234 + 8282373235.

It is an arithmetic number, because the mean of its divisors is an integer number (8282373235).

Almost surely, 2^16564746469 is an apocalyptic number.

It is an amenable number.

16564746469 is a deficient number, since it is larger than the sum of its proper divisors (1).

16564746469 is an equidigital number, since it uses as much as digits as its factorization.

16564746469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26127360, while the sum is 58.

The spelling of 16564746469 in words is "sixteen billion, five hundred sixty-four million, seven hundred forty-six thousand, four hundred sixty-nine".