661089052 has 48 divisors (see below), whose sum is σ = 1282992480. Its totient is φ = 296126208.

The previous prime is 661089019. The next prime is 661089061. The reversal of 661089052 is 250980166.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 385974 + ... + 387682.

It is an arithmetic number, because the mean of its divisors is an integer number (26729010).

Almost surely, 2^661089052 is an apocalyptic number.

It is an amenable number.

661089052 is a deficient number, since it is larger than the sum of its proper divisors (621903428).

661089052 is a wasteful number, since it uses less digits than its factorization.

661089052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942 (or 1940 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 661089052 is about 25711.6520667187. The cubic root of 661089052 is about 871.1373911479.

The spelling of 661089052 in words is "six hundred sixty-one million, eighty-nine thousand, fifty-two".