61366563 has 6 divisors (see below), whose sum is σ = 88640604. Its totient is φ = 40911036.

The previous prime is 61366559. The next prime is 61366589. The reversal of 61366563 is 36566316.

It is a happy number.

61366563 is a `hidden beast` number, since 61 + 36 + 6 + 563 = 666.

It is not a de Polignac number, because 61366563 - 2² = 61366559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61366663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3409245 + ... + 3409262.

It is an arithmetic number, because the mean of its divisors is an integer number (14773434).

Almost surely, 2^61366563 is an apocalyptic number.

61366563 is a deficient number, since it is larger than the sum of its proper divisors (27274041).

61366563 is a wasteful number, since it uses less digits than its factorization.

61366563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6818513 (or 6818510 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 61366563 is about 7833.6813185118. The cubic root of 61366563 is about 394.4366546163.

It can be divided in two parts, 613 and 66563, that added together give a palindrome (67176).

The spelling of 61366563 in words is "sixty-one million, three hundred sixty-six thousand, five hundred sixty-three".