16786570969 has 27 divisors (see below), whose sum is σ = 19854369333. Its totient is φ = 14151389112.

The previous prime is 16786570939. The next prime is 16786570991. The reversal of 16786570969 is 96907568761.

The square root of 16786570969 is 129563.

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

It is not a de Polignac number, because 16786570969 - 2⁵ = 16786570937 is a prime.

It is a super-2 number, since 2×16786570969² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16786570969.

It is not an unprimeable number, because it can be changed into a prime (16786570939) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 75275992 + ... + 75276214.

Almost surely, 2^16786570969 is an apocalyptic number.

16786570969 is the 129563-rd square number.

16786570969 is the 64782-nd centered octagonal number.

It is an amenable number.

16786570969 is a deficient number, since it is larger than the sum of its proper divisors (3067798364).

16786570969 is an frugal number, since it uses more digits than its factorization.

16786570969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 64.

Multiplying 16786570969 by its sum of digits (64), we get a square (1074340542016 = 1036504²).

The spelling of 16786570969 in words is "sixteen billion, seven hundred eighty-six million, five hundred seventy thousand, nine hundred sixty-nine".