1691274445056 has 216 divisors, whose sum is σ = 5594188279680. Its totient is φ = 481382719488.

The previous prime is 1691274445043. The next prime is 1691274445093. The reversal of 1691274445056 is 6505444721961.

1691274445056 is a `hidden beast` number, since 1 + 6 + 9 + 127 + 4 + 4 + 4 + 505 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1691274444993 and 1691274445011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4042300 + ... + 4441028.

Almost surely, 2^{1691274445056} is an apocalyptic number.

1691274445056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1691274445056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2797094139840).

1691274445056 is an abundant number, since it is smaller than the sum of its proper divisors (3902913834624).

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

1691274445056 is a wasteful number, since it uses less digits than its factorization.

1691274445056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399021 (or 399004 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 54.

The spelling of 1691274445056 in words is "one trillion, six hundred ninety-one billion, two hundred seventy-four million, four hundred forty-five thousand, fifty-six".