13820518561 has 8 divisors (see below), whose sum is σ = 14030198784. Its totient is φ = 13611255840.

The previous prime is 13820518519. The next prime is 13820518583. The reversal of 13820518561 is 16581502831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 13820518561 - 2¹⁷ = 13820387489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13820518511) 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, 37345 + ... + 170398.

It is an arithmetic number, because the mean of its divisors is an integer number (1753774848).

Almost surely, 2^13820518561 is an apocalyptic number.

It is an amenable number.

13820518561 is a deficient number, since it is larger than the sum of its proper divisors (209680223).

13820518561 is an equidigital number, since it uses as much as digits as its factorization.

13820518561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208751.

The product of its (nonzero) digits is 57600, while the sum is 40.

The spelling of 13820518561 in words is "thirteen billion, eight hundred twenty million, five hundred eighteen thousand, five hundred sixty-one".