1919168643238 has 48 divisors (see below), whose sum is σ = 3625727938560. Its totient is φ = 745775498160.

The previous prime is 1919168643209. The next prime is 1919168643253. The reversal of 1919168643238 is 8323468619191.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 830208 + ... + 2127811.

It is an arithmetic number, because the mean of its divisors is an integer number (75535998720).

Almost surely, 2^{1919168643238} is an apocalyptic number.

1919168643238 is a deficient number, since it is larger than the sum of its proper divisors (1706559295322).

1919168643238 is a wasteful number, since it uses less digits than its factorization.

1919168643238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2958433 (or 2958422 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 61.

The spelling of 1919168643238 in words is "one trillion, nine hundred nineteen billion, one hundred sixty-eight million, six hundred forty-three thousand, two hundred thirty-eight".