19555565049 has 20 divisors (see below), whose sum is σ = 30154981120. Its totient is φ = 12616491960.

The previous prime is 19555565027. The next prime is 19555565179. The reversal of 19555565049 is 94056555591.

It is not a de Polignac number, because 19555565049 - 2⁵ = 19555565017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19555564986 and 19555565004.

It is not an unprimeable number, because it can be changed into a prime (19555565009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3891469 + ... + 3896490.

It is an arithmetic number, because the mean of its divisors is an integer number (1507749056).

Almost surely, 2^19555565049 is an apocalyptic number.

It is an amenable number.

19555565049 is a deficient number, since it is larger than the sum of its proper divisors (10599416071).

19555565049 is an equidigital number, since it uses as much as digits as its factorization.

19555565049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7788002 (or 7787993 counting only the distinct ones).

The product of its (nonzero) digits is 6075000, while the sum is 54.

The spelling of 19555565049 in words is "nineteen billion, five hundred fifty-five million, five hundred sixty-five thousand, forty-nine".