163709999685 has 48 divisors (see below), whose sum is σ = 291822960000. Its totient is φ = 84852738432.

The previous prime is 163709999669. The next prime is 163709999729. The reversal of 163709999685 is 586999907361.

163709999685 is a `hidden beast` number, since 1 + 6 + 370 + 9 + 99 + 96 + 85 = 666.

It is not a de Polignac number, because 163709999685 - 2⁴ = 163709999669 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 172491 + ... + 597639.

It is an arithmetic number, because the mean of its divisors is an integer number (6079645000).

Almost surely, 2^163709999685 is an apocalyptic number.

163709999685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163709999685 is a deficient number, since it is larger than the sum of its proper divisors (128112960315).

163709999685 is a wasteful number, since it uses less digits than its factorization.

163709999685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425402 (or 425399 counting only the distinct ones).

The product of its (nonzero) digits is 198404640, while the sum is 72.

The spelling of 163709999685 in words is "one hundred sixty-three billion, seven hundred nine million, nine hundred ninety-nine thousand, six hundred eighty-five".