661171425 has 24 divisors (see below), whose sum is σ = 1094052000. Its totient is φ = 352329600.

The previous prime is 661171417. The next prime is 661171447. The reversal of 661171425 is 524171166.

661171425 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 661171425 - 2³ = 661171417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109485 + ... + 115365.

It is an arithmetic number, because the mean of its divisors is an integer number (45585500).

Almost surely, 2^661171425 is an apocalyptic number.

It is an amenable number.

661171425 is a deficient number, since it is larger than the sum of its proper divisors (432880575).

661171425 is a wasteful number, since it uses less digits than its factorization.

661171425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7393 (or 7388 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 661171425 is about 25713.2538781073. The cubic root of 661171425 is about 871.1735714577.

The spelling of 661171425 in words is "six hundred sixty-one million, one hundred seventy-one thousand, four hundred twenty-five".