661835546 has 12 divisors (see below), whose sum is σ = 997249662. Its totient is φ = 329421456.

The previous prime is 661835533. The next prime is 661835549. The reversal of 661835546 is 645538166.

It can be written as a sum of positive squares in 3 ways, for example, as 656128225 + 5707321 = 25615^2 + 2389^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 661835497 and 661835506.

It is not an unprimeable number, because it can be changed into a prime (661835549) 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 5 ways as a sum of consecutive naturals, for example, 604976 + ... + 606068.

Almost surely, 2^661835546 is an apocalyptic number.

661835546 is a deficient number, since it is larger than the sum of its proper divisors (335414116).

661835546 is an equidigital number, since it uses as much as digits as its factorization.

661835546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2465 (or 1372 counting only the distinct ones).

The product of its digits is 518400, while the sum is 44.

The square root of 661835546 is about 25726.1646189244. The cubic root of 661835546 is about 871.4651605143.

The spelling of 661835546 in words is "six hundred sixty-one million, eight hundred thirty-five thousand, five hundred forty-six".