19156489409409 has 16 divisors (see below), whose sum is σ = 27864066121920. Its totient is φ = 11609959612160.

The previous prime is 19156489409363. The next prime is 19156489409411. The reversal of 19156489409409 is 90490498465191.

It is a cyclic number.

It is not a de Polignac number, because 19156489409409 - 2⁹ = 19156489408897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19156489409609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15034357 + ... + 16258685.

It is an arithmetic number, because the mean of its divisors is an integer number (1741504132620).

Almost surely, 2^{19156489409409} is an apocalyptic number.

It is an amenable number.

19156489409409 is a deficient number, since it is larger than the sum of its proper divisors (8707576712511).

19156489409409 is a wasteful number, since it uses less digits than its factorization.

19156489409409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698480.

The product of its (nonzero) digits is 100776960, while the sum is 69.

The spelling of 19156489409409 in words is "nineteen trillion, one hundred fifty-six billion, four hundred eighty-nine million, four hundred nine thousand, four hundred nine".