16699299661 has 16 divisors (see below), whose sum is σ = 19166617728. Its totient is φ = 14521103520.

The previous prime is 16699299649. The next prime is 16699299667.

16699299661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 16699299661 - 2¹⁵ = 16699266893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16699299593 and 16699299602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16699299667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242136 + ... + 303361.

It is an arithmetic number, because the mean of its divisors is an integer number (1197913608).

Almost surely, 2^16699299661 is an apocalyptic number.

16699299661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16699299661 is a deficient number, since it is larger than the sum of its proper divisors (2467318067).

16699299661 is an equidigital number, since it uses as much as digits as its factorization.

16699299661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545553 (or 545531 counting only the distinct ones).

The product of its digits is 17006112, while the sum is 64.

The spelling of 16699299661 in words is "sixteen billion, six hundred ninety-nine million, two hundred ninety-nine thousand, six hundred sixty-one".