61267565 has 4 divisors (see below), whose sum is σ = 73521084. Its totient is φ = 49014048.

The previous prime is 61267543. The next prime is 61267567. The reversal of 61267565 is 56576216.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32741284 + 28526281 = 5722^2 + 5341^2 .

It is a cyclic number.

It is not a de Polignac number, because 61267565 - 2¹⁴ = 61251181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61267567) 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 3 ways as a sum of consecutive naturals, for example, 6126752 + ... + 6126761.

It is an arithmetic number, because the mean of its divisors is an integer number (18380271).

Almost surely, 2^61267565 is an apocalyptic number.

It is an amenable number.

61267565 is a deficient number, since it is larger than the sum of its proper divisors (12253519).

61267565 is a wasteful number, since it uses less digits than its factorization.

61267565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12253518.

The product of its digits is 75600, while the sum is 38.

The square root of 61267565 is about 7827.3600274933. The cubic root of 61267565 is about 394.2244355901.

The spelling of 61267565 in words is "sixty-one million, two hundred sixty-seven thousand, five hundred sixty-five".