19991485645677 has 216 divisors, whose sum is σ = 36797971601664. Its totient is φ = 10366351446528.

The previous prime is 19991485645639. The next prime is 19991485645751. The reversal of 19991485645677 is 77654658419991.

19991485645677 is a `hidden beast` number, since 1 + 9 + 9 + 9 + 1 + 48 + 5 + 6 + 4 + 567 + 7 = 666.

It is not a de Polignac number, because 19991485645677 - 2¹⁰ = 19991485644653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19991485645596 and 19991485645605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19991485645177) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 11212273728 + ... + 11212275510.

Almost surely, 2^{19991485645677} is an apocalyptic number.

It is an amenable number.

19991485645677 is a deficient number, since it is larger than the sum of its proper divisors (16806485955987).

19991485645677 is a wasteful number, since it uses less digits than its factorization.

19991485645677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2329 (or 2246 counting only the distinct ones).

The product of its digits is 4115059200, while the sum is 81.

The spelling of 19991485645677 in words is "nineteen trillion, nine hundred ninety-one billion, four hundred eighty-five million, six hundred forty-five thousand, six hundred seventy-seven".