2615561779 has 2 divisors, whose sum is σ = 2615561780. Its totient is φ = 2615561778.

The previous prime is 2615561723. The next prime is 2615561789. The reversal of 2615561779 is 9771655162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2615561779 - 2¹⁷ = 2615430707 is a prime.

It is not a weakly prime, because it can be changed into another prime (2615561719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1307780889 + 1307780890.

It is an arithmetic number, because the mean of its divisors is an integer number (1307780890).

Almost surely, 2^2615561779 is an apocalyptic number.

2615561779 is a deficient number, since it is larger than the sum of its proper divisors (1).

2615561779 is an equidigital number, since it uses as much as digits as its factorization.

2615561779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 49.

The square root of 2615561779 is about 51142.5632814782. The cubic root of 2615561779 is about 1377.8068115656.

The spelling of 2615561779 in words is "two billion, six hundred fifteen million, five hundred sixty-one thousand, seven hundred seventy-nine".