16465661666 has 8 divisors (see below), whose sum is σ = 24699139164. Its totient is φ = 8232615280.

The previous prime is 16465661651. The next prime is 16465661689. The reversal of 16465661666 is 66616656461.

It can be written as a sum of positive squares in 2 ways, for example, as 11925732025 + 4539929641 = 109205^2 + 67379^2 .

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

It is a super-2 number, since 2×16465661666² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 16256 + ... + 182196.

Almost surely, 2^16465661666 is an apocalyptic number.

16465661666 is a deficient number, since it is larger than the sum of its proper divisors (8233477498).

16465661666 is a wasteful number, since it uses less digits than its factorization.

16465661666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215556.

The product of its digits is 5598720, while the sum is 53.

The spelling of 16465661666 in words is "sixteen billion, four hundred sixty-five million, six hundred sixty-one thousand, six hundred sixty-six".