1891591483216 has 20 divisors (see below), whose sum is σ = 3880544293332. Its totient is φ = 890160697856.

The previous prime is 1891591483211. The next prime is 1891591483219. The reversal of 1891591483216 is 6123841951981.

It can be written as a sum of positive squares in 2 ways, for example, as 1087348417600 + 804243065616 = 1042760^2 + 896796^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891591483211) 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, 3477189955 + ... + 3477190498.

Almost surely, 2^{1891591483216} is an apocalyptic number.

1891591483216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1891591483216 is an abundant number, since it is smaller than the sum of its proper divisors (1988952810116).

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

1891591483216 is a wasteful number, since it uses less digits than its factorization.

1891591483216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6954380478 (or 6954380472 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 58.

The spelling of 1891591483216 in words is "one trillion, eight hundred ninety-one billion, five hundred ninety-one million, four hundred eighty-three thousand, two hundred sixteen".