1891481380608 has 432 divisors, whose sum is σ = 5686246573056. Its totient is φ = 556816465920.

The previous prime is 1891481380567. The next prime is 1891481380669. The reversal of 1891481380608 is 8060831841981.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 270555993 + ... + 270562983.

It is an arithmetic number, because the mean of its divisors is an integer number (13162607808).

Almost surely, 2^{1891481380608} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1891481380608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2843123286528).

1891481380608 is an abundant number, since it is smaller than the sum of its proper divisors (3794765192448).

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

1891481380608 is a wasteful number, since it uses less digits than its factorization.

1891481380608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7120 (or 7089 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 57.

The spelling of 1891481380608 in words is "one trillion, eight hundred ninety-one billion, four hundred eighty-one million, three hundred eighty thousand, six hundred eight".