19555620963 has 4 divisors (see below), whose sum is σ = 26074161288. Its totient is φ = 13037080640.

The previous prime is 19555620961. The next prime is 19555620967. The reversal of 19555620963 is 36902655591.

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 19555620963 - 2¹ = 19555620961 is a prime.

It is a super-2 number, since 2×19555620963² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19555620961) 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, 3259270158 + ... + 3259270163.

It is an arithmetic number, because the mean of its divisors is an integer number (6518540322).

Almost surely, 2^19555620963 is an apocalyptic number.

19555620963 is a deficient number, since it is larger than the sum of its proper divisors (6518540325).

19555620963 is an equidigital number, since it uses as much as digits as its factorization.

19555620963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6518540324.

The product of its (nonzero) digits is 2187000, while the sum is 51.

The spelling of 19555620963 in words is "nineteen billion, five hundred fifty-five million, six hundred twenty thousand, nine hundred sixty-three".