61545663 has 20 divisors (see below), whose sum is σ = 92861208. Its totient is φ = 40618800.

The previous prime is 61545647. The next prime is 61545683. The reversal of 61545663 is 36654516.

It is not a de Polignac number, because 61545663 - 2⁴ = 61545647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61545623) 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 19 ways as a sum of consecutive naturals, for example, 4420 + ... + 11942.

Almost surely, 2^61545663 is an apocalyptic number.

61545663 is a deficient number, since it is larger than the sum of its proper divisors (31315545).

61545663 is a wasteful number, since it uses less digits than its factorization.

61545663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7636 (or 7627 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 61545663 is about 7845.1043970109. The cubic root of 61545663 is about 394.8200066542.

The spelling of 61545663 in words is "sixty-one million, five hundred forty-five thousand, six hundred sixty-three".