16723985713009 has 9 divisors (see below), whose sum is σ = 16767845520321. Its totient is φ = 16680240363600.

The previous prime is 16723985712991. The next prime is 16723985713033. The reversal of 16723985713009 is 90031758932761.

It is a happy number.

The square root of 16723985713009 is 4089497.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 7965179730225 + 8758805982784 = 2822265^2 + 2959528^2 .

It is not a de Polignac number, because 16723985713009 - 2⁵ = 16723985712977 is a prime.

It is a super-2 number, since 2×16723985713009² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16723985719009) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1623525159 + ... + 1623535459.

Almost surely, 2^{16723985713009} is an apocalyptic number.

16723985713009 is the 4089497-th square number.

16723985713009 is the 2044749-th centered octagonal number.

It is an amenable number.

16723985713009 is a deficient number, since it is larger than the sum of its proper divisors (43859807312).

16723985713009 is an frugal number, since it uses more digits than its factorization.

16723985713009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21396 (or 10698 counting only the distinct ones).

The product of its (nonzero) digits is 17146080, while the sum is 61.

The spelling of 16723985713009 in words is "sixteen trillion, seven hundred twenty-three billion, nine hundred eighty-five million, seven hundred thirteen thousand, nine".