2015561011 has 2 divisors, whose sum is σ = 2015561012. Its totient is φ = 2015561010.

The previous prime is 2015560991. The next prime is 2015561027. The reversal of 2015561011 is 1101655102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2015561011 - 2⁵ = 2015560979 is a prime.

It is not a weakly prime, because it can be changed into another prime (2015561311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1007780505 + 1007780506.

It is an arithmetic number, because the mean of its divisors is an integer number (1007780506).

Almost surely, 2^2015561011 is an apocalyptic number.

2015561011 is a deficient number, since it is larger than the sum of its proper divisors (1).

2015561011 is an equidigital number, since it uses as much as digits as its factorization.

2015561011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 2015561011 is about 44894.9998440806. Note that the first 3 decimals coincide. The cubic root of 2015561011 is about 1263.1802193438.

The spelling of 2015561011 in words is "two billion, fifteen million, five hundred sixty-one thousand, eleven".