19647745044 has 24 divisors (see below), whose sum is σ = 45857202720. Its totient is φ = 6547467744.

The previous prime is 19647745043. The next prime is 19647745049. The reversal of 19647745044 is 44054774691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19647745043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176214 + ... + 265229.

It is an arithmetic number, because the mean of its divisors is an integer number (1910716780).

Almost surely, 2^19647745044 is an apocalyptic number.

It is an amenable number.

19647745044 is an abundant number, since it is smaller than the sum of its proper divisors (26209457676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19647745044 is a wasteful number, since it uses less digits than its factorization.

19647745044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445159 (or 445157 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 19647745044 in words is "nineteen billion, six hundred forty-seven million, seven hundred forty-five thousand, forty-four".