1599781685166 has 96 divisors (see below), whose sum is σ = 4143465930240. Its totient is φ = 436163631552.

The previous prime is 1599781685147. The next prime is 1599781685207. The reversal of 1599781685166 is 6615861879951.

1599781685166 is a `hidden beast` number, since 1 + 5 + 9 + 97 + 8 + 16 + 8 + 516 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1599781685094 and 1599781685103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 555516 + ... + 1873008.

It is an arithmetic number, because the mean of its divisors is an integer number (43161103440).

Almost surely, 2^{1599781685166} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1599781685166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2071732965120).

1599781685166 is an abundant number, since it is smaller than the sum of its proper divisors (2543684245074).

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

1599781685166 is a wasteful number, since it uses less digits than its factorization.

1599781685166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317950 (or 1317947 counting only the distinct ones).

The product of its digits is 195955200, while the sum is 72.

The spelling of 1599781685166 in words is "one trillion, five hundred ninety-nine billion, seven hundred eighty-one million, six hundred eighty-five thousand, one hundred sixty-six".