19493648551 has 16 divisors (see below), whose sum is σ = 22152070080. Its totient is φ = 17018369280.

The previous prime is 19493648539. The next prime is 19493648611. The reversal of 19493648551 is 15584639491.

It is a cyclic number.

It is not a de Polignac number, because 19493648551 - 2¹⁵ = 19493615783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19493648492 and 19493648501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19493648051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339660 + ... + 392881.

It is an arithmetic number, because the mean of its divisors is an integer number (1384504380).

Almost surely, 2^19493648551 is an apocalyptic number.

19493648551 is a deficient number, since it is larger than the sum of its proper divisors (2658421529).

19493648551 is a wasteful number, since it uses less digits than its factorization.

19493648551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732666.

The product of its digits is 4665600, while the sum is 55.

The spelling of 19493648551 in words is "nineteen billion, four hundred ninety-three million, six hundred forty-eight thousand, five hundred fifty-one".