661303412 has 36 divisors (see below), whose sum is σ = 1468613664. Its totient is φ = 257649840.

The previous prime is 661303411. The next prime is 661303427. The reversal of 661303412 is 214303166.

661303412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661303411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151208 + ... + 155519.

It is an arithmetic number, because the mean of its divisors is an integer number (40794824).

Almost surely, 2^661303412 is an apocalyptic number.

It is an amenable number.

661303412 is an abundant number, since it is smaller than the sum of its proper divisors (807310252).

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

661303412 is a wasteful number, since it uses less digits than its factorization.

661303412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306756 (or 306747 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 661303412 is about 25715.8202669096. The cubic root of 661303412 is about 871.2315372295.

Adding to 661303412 its reverse (214303166), we get a palindrome (875606578).

The spelling of 661303412 in words is "six hundred sixty-one million, three hundred three thousand, four hundred twelve".