61443666 has 24 divisors (see below), whose sum is σ = 136376604. Its totient is φ = 19981440.

The previous prime is 61443631. The next prime is 61443667. The reversal of 61443666 is 66634416.

61443666 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 61168041 + 275625 = 7821^2 + 525^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61443666.

It is not an unprimeable number, because it can be changed into a prime (61443667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40891 + ... + 42366.

Almost surely, 2^61443666 is an apocalyptic number.

61443666 is an abundant number, since it is smaller than the sum of its proper divisors (74932938).

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

61443666 is a wasteful number, since it uses less digits than its factorization.

61443666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83306 (or 83303 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 61443666 is about 7838.6010231418. The cubic root of 61443666 is about 394.6017799429.

The spelling of 61443666 in words is "sixty-one million, four hundred forty-three thousand, six hundred sixty-six".