1691114681556 has 72 divisors (see below), whose sum is σ = 4463496666720. Its totient is φ = 539180152896.

The previous prime is 1691114681537. The next prime is 1691114681579. The reversal of 1691114681556 is 6551864111961.

1691114681556 is a `hidden beast` number, since 1 + 6 + 9 + 1 + 1 + 1 + 4 + 6 + 81 + 556 = 666.

It is a super-2 number, since 2×1691114681556² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7457646 + ... + 7681061.

It is an arithmetic number, because the mean of its divisors is an integer number (61993009260).

Almost surely, 2^{1691114681556} is an apocalyptic number.

It is an amenable number.

1691114681556 is an abundant number, since it is smaller than the sum of its proper divisors (2772381985164).

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

1691114681556 is a wasteful number, since it uses less digits than its factorization.

1691114681556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15138853 (or 15138848 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 54.

The spelling of 1691114681556 in words is "one trillion, six hundred ninety-one billion, one hundred fourteen million, six hundred eighty-one thousand, five hundred fifty-six".