161568725 has 12 divisors (see below), whose sum is σ = 200552640. Its totient is φ = 129121200.

The previous prime is 161568709. The next prime is 161568733. The reversal of 161568725 is 527865161.

It is not a de Polignac number, because 161568725 - 2⁴ = 161568709 is a prime.

It is a super-4 number, since 4×161568725⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26516 + ... + 32034.

It is an arithmetic number, because the mean of its divisors is an integer number (16712720).

Almost surely, 2^161568725 is an apocalyptic number.

It is an amenable number.

161568725 is a deficient number, since it is larger than the sum of its proper divisors (38983915).

161568725 is a wasteful number, since it uses less digits than its factorization.

161568725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6700 (or 6695 counting only the distinct ones).

The product of its digits is 100800, while the sum is 41.

The square root of 161568725 is about 12710.9686884989. The cubic root of 161568725 is about 544.6519956594.

The spelling of 161568725 in words is "one hundred sixty-one million, five hundred sixty-eight thousand, seven hundred twenty-five".