17561355923 has 2 divisors, whose sum is σ = 17561355924. Its totient is φ = 17561355922.

The previous prime is 17561355907. The next prime is 17561355949. The reversal of 17561355923 is 32955316571.

It is a weak prime.

It is an emirp because it is prime and its reverse (32955316571) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17561355923 - 2⁴ = 17561355907 is a prime.

It is not a weakly prime, because it can be changed into another prime (17561355523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8780677961 + 8780677962.

It is an arithmetic number, because the mean of its divisors is an integer number (8780677962).

Almost surely, 2^17561355923 is an apocalyptic number.

17561355923 is a deficient number, since it is larger than the sum of its proper divisors (1).

17561355923 is an equidigital number, since it uses as much as digits as its factorization.

17561355923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 850500, while the sum is 47.

The spelling of 17561355923 in words is "seventeen billion, five hundred sixty-one million, three hundred fifty-five thousand, nine hundred twenty-three".