661320548 has 12 divisors (see below), whose sum is σ = 1322641152. Its totient is φ = 283423080.

The previous prime is 661320547. The next prime is 661320563. The reversal of 661320548 is 845023166.

661320548 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (661320547) 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 3 ways as a sum of consecutive naturals, for example, 11809268 + ... + 11809323.

It is an arithmetic number, because the mean of its divisors is an integer number (110220096).

Almost surely, 2^661320548 is an apocalyptic number.

It is an amenable number.

661320548 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

661320548 is a wasteful number, since it uses less digits than its factorization.

661320548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23618602 (or 23618600 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 661320548 is about 25716.1534448681. The cubic root of 661320548 is about 871.2390624161.

The spelling of 661320548 in words is "six hundred sixty-one million, three hundred twenty thousand, five hundred forty-eight".