17681689213013 has 4 divisors (see below), whose sum is σ = 20207644814880. Its totient is φ = 15155733611148.

The previous prime is 17681689213009. The next prime is 17681689213021. The reversal of 17681689213013 is 31031298618671.

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.

It is a cyclic number.

It is not a de Polignac number, because 17681689213013 - 2² = 17681689213009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 17681689213013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17681689213073) 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, 1262977800923 + ... + 1262977800936.

It is an arithmetic number, because the mean of its divisors is an integer number (5051911203720).

Almost surely, 2^{17681689213013} is an apocalyptic number.

It is an amenable number.

17681689213013 is a deficient number, since it is larger than the sum of its proper divisors (2525955601867).

17681689213013 is an equidigital number, since it uses as much as digits as its factorization.

17681689213013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525955601866.

The product of its (nonzero) digits is 2612736, while the sum is 56.

The spelling of 17681689213013 in words is "seventeen trillion, six hundred eighty-one billion, six hundred eighty-nine million, two hundred thirteen thousand, thirteen".