61565011 has 2 divisors, whose sum is σ = 61565012. Its totient is φ = 61565010.

The previous prime is 61564969. The next prime is 61565033. The reversal of 61565011 is 11056516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61565011 - 2⁹ = 61564499 is a prime.

It is not a weakly prime, because it can be changed into another prime (61565071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30782505 + 30782506.

It is an arithmetic number, because the mean of its divisors is an integer number (30782506).

Almost surely, 2^61565011 is an apocalyptic number.

61565011 is a deficient number, since it is larger than the sum of its proper divisors (1).

61565011 is an equidigital number, since it uses as much as digits as its factorization.

61565011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 61565011 is about 7846.3374258312. The cubic root of 61565011 is about 394.8613752726.

The spelling of 61565011 in words is "sixty-one million, five hundred sixty-five thousand, eleven".