13681720851 has 8 divisors (see below), whose sum is σ = 18244285584. Its totient is φ = 9120151680.

The previous prime is 13681720847. The next prime is 13681720859. The reversal of 13681720851 is 15802718631.

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

It is not a de Polignac number, because 13681720851 - 2² = 13681720847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13681720859) 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, 216210 + ... + 272231.

It is an arithmetic number, because the mean of its divisors is an integer number (2280535698).

Almost surely, 2^13681720851 is an apocalyptic number.

13681720851 is a deficient number, since it is larger than the sum of its proper divisors (4562564733).

13681720851 is an equidigital number, since it uses as much as digits as its factorization.

13681720851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497781.

The product of its (nonzero) digits is 80640, while the sum is 42.

The spelling of 13681720851 in words is "thirteen billion, six hundred eighty-one million, seven hundred twenty thousand, eight hundred fifty-one".