61566523 has 2 divisors, whose sum is σ = 61566524. Its totient is φ = 61566522.

The previous prime is 61566511. The next prime is 61566539. The reversal of 61566523 is 32566516.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61566523 is a prime.

It is not a weakly prime, because it can be changed into another prime (61566553) 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 as a sum of consecutive naturals, namely, 30783261 + 30783262.

It is an arithmetic number, because the mean of its divisors is an integer number (30783262).

Almost surely, 2^61566523 is an apocalyptic number.

61566523 is a deficient number, since it is larger than the sum of its proper divisors (1).

61566523 is an equidigital number, since it uses as much as digits as its factorization.

61566523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 34.

The square root of 61566523 is about 7846.4337759265. The cubic root of 61566523 is about 394.8646077662.

The spelling of 61566523 in words is "sixty-one million, five hundred sixty-six thousand, five hundred twenty-three".