61550566 has 24 divisors (see below), whose sum is σ = 117165096. Its totient is φ = 23980320.

The previous prime is 61550563. The next prime is 61550569. The reversal of 61550566 is 66505516.

It is an interprime number because it is at equal distance from previous prime (61550563) and next prime (61550569).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61550563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27471 + ... + 29626.

It is an arithmetic number, because the mean of its divisors is an integer number (4881879).

Almost surely, 2^61550566 is an apocalyptic number.

61550566 is a deficient number, since it is larger than the sum of its proper divisors (55614530).

61550566 is a wasteful number, since it uses less digits than its factorization.

61550566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57124 (or 57117 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 61550566 is about 7845.4168786623. The cubic root of 61550566 is about 394.8304907457.

The spelling of 61550566 in words is "sixty-one million, five hundred fifty thousand, five hundred sixty-six".