1681765125 has 32 divisors (see below), whose sum is σ = 2806078080. Its totient is φ = 894499200.

The previous prime is 1681765121. The next prime is 1681765133. The reversal of 1681765125 is 5215671861.

It is not a de Polignac number, because 1681765125 - 2² = 1681765121 is a prime.

It is a super-3 number, since 3×1681765125³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681765121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136209 + ... + 148041.

It is an arithmetic number, because the mean of its divisors is an integer number (87689940).

Almost surely, 2^1681765125 is an apocalyptic number.

1681765125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1681765125 is a deficient number, since it is larger than the sum of its proper divisors (1124312955).

1681765125 is a wasteful number, since it uses less digits than its factorization.

1681765125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12230 (or 12220 counting only the distinct ones).

The product of its digits is 100800, while the sum is 42.

The square root of 1681765125 is about 41009.3297311721. The cubic root of 1681765125 is about 1189.2005847161.

The spelling of 1681765125 in words is "one billion, six hundred eighty-one million, seven hundred sixty-five thousand, one hundred twenty-five".