61365565 has 8 divisors (see below), whose sum is σ = 73709568. Its totient is φ = 49045200.

The previous prime is 61365553. The next prime is 61365569. The reversal of 61365565 is 56556316.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61365565 - 2⁵ = 61365533 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 (61365569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424 + ... + 11086.

It is an arithmetic number, because the mean of its divisors is an integer number (9213696).

Almost surely, 2^61365565 is an apocalyptic number.

It is an amenable number.

61365565 is a deficient number, since it is larger than the sum of its proper divisors (12344003).

61365565 is a wasteful number, since it uses less digits than its factorization.

61365565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11819.

The product of its digits is 81000, while the sum is 37.

The square root of 61365565 is about 7833.6176189549. The cubic root of 61365565 is about 394.4345163731.

Subtracting from 61365565 its reverse (56556316), we obtain a square (4809249 = 2193²).

The spelling of 61365565 in words is "sixty-one million, three hundred sixty-five thousand, five hundred sixty-five".