1685732972080 has 20 divisors (see below), whose sum is σ = 3919329160272. Its totient is φ = 674293188800.

The previous prime is 1685732971997. The next prime is 1685732972081. The reversal of 1685732972080 is 802792375861.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (1685732972081) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10535830996 + ... + 10535831155.

Almost surely, 2^{1685732972080} is an apocalyptic number.

1685732972080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685732972080 is an abundant number, since it is smaller than the sum of its proper divisors (2233596188192).

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

1685732972080 is a wasteful number, since it uses less digits than its factorization.

1685732972080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21071662164 (or 21071662158 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 1685732972080 in words is "one trillion, six hundred eighty-five billion, seven hundred thirty-two million, nine hundred seventy-two thousand, eighty".