661575852 has 54 divisors (see below), whose sum is σ = 1945353228. Its totient is φ = 189021168.

The previous prime is 661575851. The next prime is 661575857. The reversal of 661575852 is 258575166.

661575852 is a `hidden beast` number, since 6 + 61 + 5 + 7 + 585 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 661575798 and 661575807.

It is not an unprimeable number, because it can be changed into a prime (661575851) 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 17 ways as a sum of consecutive naturals, for example, 185758 + ... + 189285.

Almost surely, 2^661575852 is an apocalyptic number.

It is an amenable number.

661575852 is an abundant number, since it is smaller than the sum of its proper divisors (1283777376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661575852 is a wasteful number, since it uses less digits than its factorization.

661575852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375067 (or 375055 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The square root of 661575852 is about 25721.1168497793. The cubic root of 661575852 is about 871.3511624666.

The spelling of 661575852 in words is "six hundred sixty-one million, five hundred seventy-five thousand, eight hundred fifty-two".