19561796027 has 4 divisors (see below), whose sum is σ = 20016721560. Its totient is φ = 19106870496.

The previous prime is 19561796021. The next prime is 19561796077. The reversal of 19561796027 is 72069716591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72069716591 = 41621 ⋅1731571.

It is a cyclic number.

It is not a de Polignac number, because 19561796027 - 2¹⁶ = 19561730491 is a prime.

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 19561796027.

It is not an unprimeable number, because it can be changed into a prime (19561796021) 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, 227462702 + ... + 227462787.

It is an arithmetic number, because the mean of its divisors is an integer number (5004180390).

Almost surely, 2^19561796027 is an apocalyptic number.

19561796027 is a deficient number, since it is larger than the sum of its proper divisors (454925533).

19561796027 is an equidigital number, since it uses as much as digits as its factorization.

19561796027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454925532.

The product of its (nonzero) digits is 1428840, while the sum is 53.

The spelling of 19561796027 in words is "nineteen billion, five hundred sixty-one million, seven hundred ninety-six thousand, twenty-seven".