16564044272749 has 2 divisors, whose sum is σ = 16564044272750. Its totient is φ = 16564044272748.

The previous prime is 16564044272693. The next prime is 16564044272753. The reversal of 16564044272749 is 94727244046561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14975390738025 + 1588653534724 = 3869805^2 + 1260418^2 .

It is a cyclic number.

It is not a de Polignac number, because 16564044272749 - 2¹³ = 16564044264557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16564044272759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8282022136374 + 8282022136375.

It is an arithmetic number, because the mean of its divisors is an integer number (8282022136375).

Almost surely, 2^{16564044272749} is an apocalyptic number.

It is an amenable number.

16564044272749 is a deficient number, since it is larger than the sum of its proper divisors (1).

16564044272749 is an equidigital number, since it uses as much as digits as its factorization.

16564044272749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81285120, while the sum is 61.

The spelling of 16564044272749 in words is "sixteen trillion, five hundred sixty-four billion, forty-four million, two hundred seventy-two thousand, seven hundred forty-nine".