61537565 has 8 divisors (see below), whose sum is σ = 76391640. Its totient is φ = 47532352.

The previous prime is 61537547. The next prime is 61537571. The reversal of 61537565 is 56573516.

It can be written as a sum of positive squares in 4 ways, for example, as 8145316 + 53392249 = 2854^2 + 7307^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61537565 - 2⁸ = 61537309 is a prime.

It is a super-2 number, since 2×61537565² = 7573743812258450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 212054 + ... + 212343.

It is an arithmetic number, because the mean of its divisors is an integer number (9548955).

Almost surely, 2^61537565 is an apocalyptic number.

It is an amenable number.

61537565 is a deficient number, since it is larger than the sum of its proper divisors (14854075).

61537565 is a wasteful number, since it uses less digits than its factorization.

61537565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424431.

The product of its digits is 94500, while the sum is 38.

The square root of 61537565 is about 7844.5882619804. The cubic root of 61537565 is about 394.8026894705.

The spelling of 61537565 in words is "sixty-one million, five hundred thirty-seven thousand, five hundred sixty-five".