661420132 has 12 divisors (see below), whose sum is σ = 1157943276. Its totient is φ = 330579200.

The previous prime is 661420121. The next prime is 661420171. The reversal of 661420132 is 231024166.

661420132 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 76457536 + 584962596 = 8744^2 + 24186^2 .

It is a junction number, because it is equal to n+sod(n) for n = 661420097 and 661420106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20869 + ... + 41932.

It is an arithmetic number, because the mean of its divisors is an integer number (96495273).

Almost surely, 2^661420132 is an apocalyptic number.

It is an amenable number.

661420132 is a deficient number, since it is larger than the sum of its proper divisors (496523144).

661420132 is a wasteful number, since it uses less digits than its factorization.

661420132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65438 (or 65436 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 661420132 is about 25718.0895869036. The cubic root of 661420132 is about 871.2827916467.

Adding to 661420132 its reverse (231024166), we get a palindrome (892444298).

The spelling of 661420132 in words is "six hundred sixty-one million, four hundred twenty thousand, one hundred thirty-two".