1891299905068 has 12 divisors (see below), whose sum is σ = 3782599810192. Its totient is φ = 810557102160.

The previous prime is 1891299905063. The next prime is 1891299905069. The reversal of 1891299905068 is 8605099921981.

1891299905068 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1891299904994 and 1891299905012.

It is not an unprimeable number, because it can be changed into a prime (1891299905063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33773212563 + ... + 33773212618.

Almost surely, 2^{1891299905068} is an apocalyptic number.

It is an amenable number.

1891299905068 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1891299905068 is a wasteful number, since it uses less digits than its factorization.

1891299905068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67546425192 (or 67546425190 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 67.

The spelling of 1891299905068 in words is "one trillion, eight hundred ninety-one billion, two hundred ninety-nine million, nine hundred five thousand, sixty-eight".