661530888 has 40 divisors (see below), whose sum is σ = 1852900830. Its totient is φ = 220510080.

The previous prime is 661530887. The next prime is 661530889. The reversal of 661530888 is 888035166.

It is an interprime number because it is at equal distance from previous prime (661530887) and next prime (661530889).

It can be written as a sum of positive squares in only one way, i.e., 635947524 + 25583364 = 25218^2 + 5058^2 .

It is not an unprimeable number, because it can be changed into a prime (661530887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 509793 + ... + 511088.

Almost surely, 2^661530888 is an apocalyptic number.

It is an amenable number.

661530888 is an abundant number, since it is smaller than the sum of its proper divisors (1191369942).

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

661530888 is a wasteful number, since it uses less digits than its factorization.

661530888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020899 (or 1020886 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 661530888 is about 25720.2427671280. The cubic root of 661530888 is about 871.3314215600.

The spelling of 661530888 in words is "six hundred sixty-one million, five hundred thirty thousand, eight hundred eighty-eight".