19555145503 has 4 divisors (see below), whose sum is σ = 19556194840. Its totient is φ = 19554096168.

The previous prime is 19555145501. The next prime is 19555145531. The reversal of 19555145503 is 30554155591.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19555145503 - 2¹ = 19555145501 is a prime.

It is a super-2 number, since 2×19555145503² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19555145503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19555145501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496200 + ... + 534157.

It is an arithmetic number, because the mean of its divisors is an integer number (4889048710).

Almost surely, 2^19555145503 is an apocalyptic number.

19555145503 is a deficient number, since it is larger than the sum of its proper divisors (1049337).

19555145503 is a wasteful number, since it uses less digits than its factorization.

19555145503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049336.

The product of its (nonzero) digits is 337500, while the sum is 43.

The spelling of 19555145503 in words is "nineteen billion, five hundred fifty-five million, one hundred forty-five thousand, five hundred three".