661548 has 24 divisors (see below), whose sum is σ = 1597680. Its totient is φ = 212800.

The previous prime is 661547. The next prime is 661553. The reversal of 661548 is 845166.

It is not an unprimeable number, because it can be changed into a prime (661541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 603 + ... + 1298.

It is an arithmetic number, because the mean of its divisors is an integer number (66570).

2⁶⁶¹⁵⁴⁸ is an apocalyptic number.

It is an amenable number.

661548 is an abundant number, since it is smaller than the sum of its proper divisors (936132).

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

661548 is a wasteful number, since it uses less digits than its factorization.

661548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937 (or 1935 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 661548 is about 813.3560106128. The cubic root of 661548 is about 87.1338934484.

The spelling of 661548 in words is "six hundred sixty-one thousand, five hundred forty-eight".