16664366601 has 20 divisors (see below), whose sum is σ = 25135382272. Its totient is φ = 11001712248.

The previous prime is 16664366597. The next prime is 16664366639. The reversal of 16664366601 is 10666346661.

It is not a de Polignac number, because 16664366601 - 2² = 16664366597 is a prime.

It is a super-2 number, since 2×16664366601² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16664366701) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 990361 + ... + 1007046.

Almost surely, 2^16664366601 is an apocalyptic number.

It is an amenable number.

16664366601 is a deficient number, since it is larger than the sum of its proper divisors (8471015671).

16664366601 is a wasteful number, since it uses less digits than its factorization.

16664366601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997522 (or 1997513 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The spelling of 16664366601 in words is "sixteen billion, six hundred sixty-four million, three hundred sixty-six thousand, six hundred one".