16686271601 has 4 divisors (see below), whose sum is σ = 16782724212. Its totient is φ = 16589818992.

The previous prime is 16686271531. The next prime is 16686271603. The reversal of 16686271601 is 10617268661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10617268661 = 42491 ⋅249871.

It can be written as a sum of positive squares in 2 ways, for example, as 11426541025 + 5259730576 = 106895^2 + 72524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16686271601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16686271603) 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, 48226046 + ... + 48226391.

It is an arithmetic number, because the mean of its divisors is an integer number (4195681053).

Almost surely, 2^16686271601 is an apocalyptic number.

It is an amenable number.

16686271601 is a deficient number, since it is larger than the sum of its proper divisors (96452611).

16686271601 is an equidigital number, since it uses as much as digits as its factorization.

16686271601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96452610.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 16686271601 in words is "sixteen billion, six hundred eighty-six million, two hundred seventy-one thousand, six hundred one".