661668488 has 32 divisors (see below), whose sum is σ = 1343563200. Its totient is φ = 303670848.

The previous prime is 661668479. The next prime is 661668547. The reversal of 661668488 is 884866166.

It is a super-2 number, since 2×661668488² = 875610376024412288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 845 + ... + 36387.

It is an arithmetic number, because the mean of its divisors is an integer number (41986350).

Almost surely, 2^661668488 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 661668488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (671781600).

661668488 is an abundant number, since it is smaller than the sum of its proper divisors (681894712).

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

661668488 is a wasteful number, since it uses less digits than its factorization.

661668488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35741 (or 35737 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 53.

The square root of 661668488 is about 25722.9175639156. The cubic root of 661668488 is about 871.3918303753.

The spelling of 661668488 in words is "six hundred sixty-one million, six hundred sixty-eight thousand, four hundred eighty-eight".