661171041 has 24 divisors (see below), whose sum is σ = 998015616. Its totient is φ = 420995520.

The previous prime is 661171033. The next prime is 661171057. The reversal of 661171041 is 140171166.

661171041 is a `hidden beast` number, since 6 + 611 + 7 + 1 + 0 + 41 = 666.

661171041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661171041 - 2³ = 661171033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661170996 and 661171014.

It is not an unprimeable number, because it can be changed into a prime (661171031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168421 + ... + 172301.

It is an arithmetic number, because the mean of its divisors is an integer number (41583984).

Almost surely, 2^661171041 is an apocalyptic number.

It is an amenable number.

661171041 is a deficient number, since it is larger than the sum of its proper divisors (336844575).

661171041 is a wasteful number, since it uses less digits than its factorization.

661171041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733 (or 4730 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 661171041 is about 25713.2464111399. The cubic root of 661171041 is about 871.1734028022.

The spelling of 661171041 in words is "six hundred sixty-one million, one hundred seventy-one thousand, forty-one".