19931503216691 has 16 divisors (see below), whose sum is σ = 22887999152640. Its totient is φ = 17165776511520.

The previous prime is 19931503216637. The next prime is 19931503216697. The reversal of 19931503216691 is 19661230513991.

It is a cyclic number.

It is not a de Polignac number, because 19931503216691 - 2⁶ = 19931503216627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19931503216697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60163286 + ... + 60493668.

It is an arithmetic number, because the mean of its divisors is an integer number (1430499947040).

Almost surely, 2^{19931503216691} is an apocalyptic number.

19931503216691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19931503216691 is a deficient number, since it is larger than the sum of its proper divisors (2956495935949).

19931503216691 is a wasteful number, since it uses less digits than its factorization.

19931503216691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619066.

The product of its (nonzero) digits is 2361960, while the sum is 56.

The spelling of 19931503216691 in words is "nineteen trillion, nine hundred thirty-one billion, five hundred three million, two hundred sixteen thousand, six hundred ninety-one".