61563663 has 24 divisors (see below), whose sum is σ = 106050048. Its totient is φ = 33648912.

The previous prime is 61563661. The next prime is 61563731. The reversal of 61563663 is 36636516.

It is a happy number.

61563663 is a `hidden beast` number, since 6 + 15 + 636 + 6 + 3 = 666.

It is not a de Polignac number, because 61563663 - 2¹ = 61563661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61563661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19795 + ... + 22692.

It is an arithmetic number, because the mean of its divisors is an integer number (4418752).

Almost surely, 2^61563663 is an apocalyptic number.

61563663 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

61563663 is a deficient number, since it is larger than the sum of its proper divisors (44486385).

61563663 is a wasteful number, since it uses less digits than its factorization.

61563663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42523 (or 42520 counting only the distinct ones).

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

The square root of 61563663 is about 7846.2515254101. The cubic root of 61563663 is about 394.8584933488.

It can be divided in two parts, 61563 and 663, that added together give a palindrome (62226).

The spelling of 61563663 in words is "sixty-one million, five hundred sixty-three thousand, six hundred sixty-three".