1656725661 has 6 divisors (see below), whose sum is σ = 2393048190. Its totient is φ = 1104483768.

The previous prime is 1656725639. The next prime is 1656725699. The reversal of 1656725661 is 1665276561.

1656725661 is a `hidden beast` number, since 1 + 6 + 567 + 25 + 6 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1639035225 + 17690436 = 40485^2 + 4206^2 .

It is not a de Polignac number, because 1656725661 - 2⁶ = 1656725597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656725611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92040306 + ... + 92040323.

It is an arithmetic number, because the mean of its divisors is an integer number (398841365).

Almost surely, 2^1656725661 is an apocalyptic number.

It is an amenable number.

1656725661 is a deficient number, since it is larger than the sum of its proper divisors (736322529).

1656725661 is a wasteful number, since it uses less digits than its factorization.

1656725661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184080635 (or 184080632 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 1656725661 is about 40702.8949953194. The cubic root of 1656725661 is about 1183.2691260716.

The spelling of 1656725661 in words is "one billion, six hundred fifty-six million, seven hundred twenty-five thousand, six hundred sixty-one".