661498352 has 40 divisors (see below), whose sum is σ = 1328970000. Its totient is φ = 318592512.

The previous prime is 661498309. The next prime is 661498379. The reversal of 661498352 is 253894166.

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 7 ways as a sum of consecutive naturals, for example, 230108 + ... + 232964.

It is an arithmetic number, because the mean of its divisors is an integer number (33224250).

Almost surely, 2^661498352 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661498352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (664485000).

661498352 is an abundant number, since it is smaller than the sum of its proper divisors (667471648).

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

661498352 is a wasteful number, since it uses less digits than its factorization.

661498352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3393 (or 3387 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 661498352 is about 25719.6102614328. The cubic root of 661498352 is about 871.3171364603.

The spelling of 661498352 in words is "six hundred sixty-one million, four hundred ninety-eight thousand, three hundred fifty-two".