16605568690 has 8 divisors (see below), whose sum is σ = 29890023660. Its totient is φ = 6642227472.

The previous prime is 16605568673. The next prime is 16605568691. The reversal of 16605568690 is 9686550661.

It can be written as a sum of positive squares in 2 ways, for example, as 15725912409 + 879656281 = 125403^2 + 29659^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×16605568690² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16605568691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 830278425 + ... + 830278444.

Almost surely, 2^16605568690 is an apocalyptic number.

16605568690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16605568690 is a deficient number, since it is larger than the sum of its proper divisors (13284454970).

16605568690 is a wasteful number, since it uses less digits than its factorization.

16605568690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660556876.

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 16605568690 in words is "sixteen billion, six hundred five million, five hundred sixty-eight thousand, six hundred ninety".