19481557100545 has 32 divisors (see below), whose sum is σ = 25281483454080. Its totient is φ = 14361305287680.

The previous prime is 19481557100539. The next prime is 19481557100561. The reversal of 19481557100545 is 54500175518491.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-19481557100545 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10082394 + ... + 11858236.

It is an arithmetic number, because the mean of its divisors is an integer number (790046357940).

Almost surely, 2^{19481557100545} is an apocalyptic number.

It is an amenable number.

19481557100545 is a deficient number, since it is larger than the sum of its proper divisors (5799926353535).

19481557100545 is a wasteful number, since it uses less digits than its factorization.

19481557100545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779025.

The product of its (nonzero) digits is 5040000, while the sum is 55.

The spelling of 19481557100545 in words is "nineteen trillion, four hundred eighty-one billion, five hundred fifty-seven million, one hundred thousand, five hundred forty-five".