661543132 has 48 divisors (see below), whose sum is σ = 1210521312. Its totient is φ = 316108800.

The previous prime is 661543123. The next prime is 661543171. The reversal of 661543132 is 231345166.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 661543094 and 661543103.

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 15 ways as a sum of consecutive naturals, for example, 1962868 + ... + 1963204.

It is an arithmetic number, because the mean of its divisors is an integer number (25219194).

Almost surely, 2^661543132 is an apocalyptic number.

It is an amenable number.

661543132 is a deficient number, since it is larger than the sum of its proper divisors (548978180).

661543132 is a wasteful number, since it uses less digits than its factorization.

661543132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598 (or 596 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 661543132 is about 25720.4807886633. The cubic root of 661543132 is about 871.3367972304.

Adding to 661543132 its reverse (231345166), we get a palindrome (892888298).

The spelling of 661543132 in words is "six hundred sixty-one million, five hundred forty-three thousand, one hundred thirty-two".