16630681601 has 4 divisors (see below), whose sum is σ = 16631763204. Its totient is φ = 16629600000.

The previous prime is 16630681577. The next prime is 16630681607. The reversal of 16630681601 is 10618603661.

It is a Cunningham number, because it is equal to 128960²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10618603661 = 3709 ⋅2862929.

It can be written as a sum of positive squares in 2 ways, for example, as 15685057600 + 945624001 = 125240^2 + 30751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16630681601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16630681607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517400 + ... + 548601.

It is an arithmetic number, because the mean of its divisors is an integer number (4157940801).

Almost surely, 2^16630681601 is an apocalyptic number.

It is an amenable number.

16630681601 is a deficient number, since it is larger than the sum of its proper divisors (1081603).

16630681601 is a wasteful number, since it uses less digits than its factorization.

16630681601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081602.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 16630681601 in words is "sixteen billion, six hundred thirty million, six hundred eighty-one thousand, six hundred one".