16637694361 has 4 divisors (see below), whose sum is σ = 16638026112. Its totient is φ = 16637362612.

The previous prime is 16637694287. The next prime is 16637694407. The reversal of 16637694361 is 16349673661.

It is a happy number.

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: 16349673661 = 179 ⋅91338959.

It is a cyclic number.

It is not a de Polignac number, because 16637694361 - 2⁷ = 16637694233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16637694299 and 16637694308.

It is not an unprimeable number, because it can be changed into a prime (16637697361) 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, 73501 + ... + 196666.

It is an arithmetic number, because the mean of its divisors is an integer number (4159506528).

Almost surely, 2^16637694361 is an apocalyptic number.

It is an amenable number.

16637694361 is a deficient number, since it is larger than the sum of its proper divisors (331751).

16637694361 is an equidigital number, since it uses as much as digits as its factorization.

16637694361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331750.

The product of its digits is 2939328, while the sum is 52.

The spelling of 16637694361 in words is "sixteen billion, six hundred thirty-seven million, six hundred ninety-four thousand, three hundred sixty-one".