16166764709 has 4 divisors (see below), whose sum is σ = 16688273280. Its totient is φ = 15645256140.

The previous prime is 16166764673. The next prime is 16166764777. The reversal of 16166764709 is 90746766161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90746766161 = 84457 ⋅1074473.

It is a cyclic number.

It is not a de Polignac number, because 16166764709 - 2¹² = 16166760613 is a prime.

It is a super-2 number, since 2×16166764709² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16166764409) 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, 260754239 + ... + 260754300.

It is an arithmetic number, because the mean of its divisors is an integer number (4172068320).

Almost surely, 2^16166764709 is an apocalyptic number.

It is an amenable number.

16166764709 is a deficient number, since it is larger than the sum of its proper divisors (521508571).

16166764709 is an equidigital number, since it uses as much as digits as its factorization.

16166764709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521508570.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The spelling of 16166764709 in words is "sixteen billion, one hundred sixty-six million, seven hundred sixty-four thousand, seven hundred nine".