1680725571 has 8 divisors (see below), whose sum is σ = 2561105664. Its totient is φ = 960414600.

The previous prime is 1680725567. The next prime is 1680725581. The reversal of 1680725571 is 1755270861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1680725571 - 2² = 1680725567 is a prime.

It is a super-3 number, since 3×1680725571³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1680725521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40017255 + ... + 40017296.

It is an arithmetic number, because the mean of its divisors is an integer number (320138208).

Almost surely, 2^1680725571 is an apocalyptic number.

1680725571 is a deficient number, since it is larger than the sum of its proper divisors (880380093).

1680725571 is an equidigital number, since it uses as much as digits as its factorization.

1680725571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80034561.

The product of its (nonzero) digits is 117600, while the sum is 42.

The square root of 1680725571 is about 40996.6531682770. The cubic root of 1680725571 is about 1188.9555062936.

The spelling of 1680725571 in words is "one billion, six hundred eighty million, seven hundred twenty-five thousand, five hundred seventy-one".