661441730 has 16 divisors (see below), whose sum is σ = 1229001984. Its totient is φ = 256041840.

The previous prime is 661441723. The next prime is 661441733. The reversal of 661441730 is 37144166.

661441730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (661441733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1066532 + ... + 1067151.

It is an arithmetic number, because the mean of its divisors is an integer number (76812624).

Almost surely, 2^661441730 is an apocalyptic number.

661441730 is a deficient number, since it is larger than the sum of its proper divisors (567560254).

661441730 is a wasteful number, since it uses less digits than its factorization.

661441730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133721.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 661441730 is about 25718.5094824720. The cubic root of 661441730 is about 871.2922751605.

Adding to 661441730 its reverse (37144166), we get a palindrome (698585896).

The spelling of 661441730 in words is "six hundred sixty-one million, four hundred forty-one thousand, seven hundred thirty".