1685716953172 has 24 divisors (see below), whose sum is σ = 3397980637184. Its totient is φ = 716761537632.

The previous prime is 1685716953169. The next prime is 1685716953181. The reversal of 1685716953172 is 2713596175861.

It is a super-3 number, since 3×1685716953172³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1685716953172.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237020763 + ... + 237027874.

Almost surely, 2^{1685716953172} is an apocalyptic number.

It is an amenable number.

1685716953172 is an abundant number, since it is smaller than the sum of its proper divisors (1712263684012).

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

1685716953172 is a wasteful number, since it uses less digits than its factorization.

1685716953172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474048775 (or 474048773 counting only the distinct ones).

The product of its digits is 19051200, while the sum is 61.

The spelling of 1685716953172 in words is "one trillion, six hundred eighty-five billion, seven hundred sixteen million, nine hundred fifty-three thousand, one hundred seventy-two".