16256691079469 has 2 divisors, whose sum is σ = 16256691079470. Its totient is φ = 16256691079468.

The previous prime is 16256691079457. The next prime is 16256691079483. The reversal of 16256691079469 is 96497019665261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15217504525444 + 1039186554025 = 3900962^2 + 1019405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16256691079469 is a prime.

It is a super-2 number, since 2×16256691079469² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16256691079969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8128345539734 + 8128345539735.

It is an arithmetic number, because the mean of its divisors is an integer number (8128345539735).

Almost surely, 2^{16256691079469} is an apocalyptic number.

It is an amenable number.

16256691079469 is a deficient number, since it is larger than the sum of its proper divisors (1).

16256691079469 is an equidigital number, since it uses as much as digits as its factorization.

16256691079469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264539520, while the sum is 71.

The spelling of 16256691079469 in words is "sixteen trillion, two hundred fifty-six billion, six hundred ninety-one million, seventy-nine thousand, four hundred sixty-nine".