61565663 has 4 divisors (see below), whose sum is σ = 62050560. Its totient is φ = 61080768.

The previous prime is 61565657. The next prime is 61565711. The reversal of 61565663 is 36656516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61565663 - 2²⁰ = 60517087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61565363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242258 + ... + 242511.

It is an arithmetic number, because the mean of its divisors is an integer number (15512640).

Almost surely, 2^61565663 is an apocalyptic number.

61565663 is a deficient number, since it is larger than the sum of its proper divisors (484897).

61565663 is a wasteful number, since it uses less digits than its factorization.

61565663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484896.

The product of its digits is 97200, while the sum is 38.

The square root of 61565663 is about 7846.3789737687. The cubic root of 61565663 is about 394.8627691851.

The spelling of 61565663 in words is "sixty-one million, five hundred sixty-five thousand, six hundred sixty-three".