17680321402649 has 8 divisors (see below), whose sum is σ = 17725348535400. Its totient is φ = 17635319382016.

The previous prime is 17680321402637. The next prime is 17680321402657. The reversal of 17680321402649 is 94620412308671.

It can be written as a sum of positive squares in 4 ways, for example, as 13973279467225 + 3707041935424 = 3738085^2 + 1925368^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17680321402649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17680321402649.

It is not an unprimeable number, because it can be changed into a prime (17680321401649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4867724 + ... + 7684749.

It is an arithmetic number, because the mean of its divisors is an integer number (2215668566925).

Almost surely, 2^{17680321402649} is an apocalyptic number.

It is an amenable number.

17680321402649 is a deficient number, since it is larger than the sum of its proper divisors (45027132751).

17680321402649 is a wasteful number, since it uses less digits than its factorization.

17680321402649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12556059.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 17680321402649 in words is "seventeen trillion, six hundred eighty billion, three hundred twenty-one million, four hundred two thousand, six hundred forty-nine".