61543066 has 16 divisors (see below), whose sum is σ = 99593928. Its totient is φ = 28353600.

The previous prime is 61543061. The next prime is 61543067. The reversal of 61543066 is 66034516.

61543066 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 4 ways, for example, as 58967041 + 2576025 = 7679^2 + 1605^2 .

It is not an unprimeable number, because it can be changed into a prime (61543061) 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 7 ways as a sum of consecutive naturals, for example, 15396 + ... + 18976.

Almost surely, 2^61543066 is an apocalyptic number.

61543066 is a deficient number, since it is larger than the sum of its proper divisors (38050862).

61543066 is a wasteful number, since it uses less digits than its factorization.

61543066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4257.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 61543066 is about 7844.9388780283. The cubic root of 61543066 is about 394.8144532600.

It can be divided in two parts, 615 and 43066, that added together give a square (43681 = 209²).

The spelling of 61543066 in words is "sixty-one million, five hundred forty-three thousand, sixty-six".