17720487823 has 2 divisors, whose sum is σ = 17720487824. Its totient is φ = 17720487822.

The previous prime is 17720487817. The next prime is 17720487853. The reversal of 17720487823 is 32878402771.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17720487823 - 2⁵ = 17720487791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17720487853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8860243911 + 8860243912.

It is an arithmetic number, because the mean of its divisors is an integer number (8860243912).

Almost surely, 2^17720487823 is an apocalyptic number.

17720487823 is a deficient number, since it is larger than the sum of its proper divisors (1).

17720487823 is an equidigital number, since it uses as much as digits as its factorization.

17720487823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1053696, while the sum is 49.

The spelling of 17720487823 in words is "seventeen billion, seven hundred twenty million, four hundred eighty-seven thousand, eight hundred twenty-three".