661044412 has 24 divisors (see below), whose sum is σ = 1322635104. Its totient is φ = 283187712.

The previous prime is 661044407. The next prime is 661044413. The reversal of 661044412 is 214440166.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661044413) 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, 122148 + ... + 127444.

It is an arithmetic number, because the mean of its divisors is an integer number (55109796).

Almost surely, 2^661044412 is an apocalyptic number.

It is an amenable number.

661044412 is an abundant number, since it is smaller than the sum of its proper divisors (661590692).

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

661044412 is a wasteful number, since it uses less digits than its factorization.

661044412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9765 (or 9763 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 661044412 is about 25710.7839631544. The cubic root of 661044412 is about 871.1177828726.

Adding to 661044412 its reverse (214440166), we get a palindrome (875484578).

The spelling of 661044412 in words is "six hundred sixty-one million, forty-four thousand, four hundred twelve".