1725725661 has 8 divisors (see below), whose sum is σ = 2510146464. Its totient is φ = 1045894320.

The previous prime is 1725725623. The next prime is 1725725669. The reversal of 1725725661 is 1665275271.

It is a happy number.

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

It is not a de Polignac number, because 1725725661 - 2¹⁷ = 1725594589 is a prime.

It is a super-3 number, since 3×1725725661³ (a number of 29 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1725725669) 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, 26147326 + ... + 26147391.

It is an arithmetic number, because the mean of its divisors is an integer number (313768308).

Almost surely, 2^1725725661 is an apocalyptic number.

1725725661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1725725661 is a deficient number, since it is larger than the sum of its proper divisors (784420803).

1725725661 is a wasteful number, since it uses less digits than its factorization.

1725725661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52294731.

The product of its digits is 176400, while the sum is 42.

The square root of 1725725661 is about 41541.8543278944. The cubic root of 1725725661 is about 1199.4733014966.

The spelling of 1725725661 in words is "one billion, seven hundred twenty-five million, seven hundred twenty-five thousand, six hundred sixty-one".