2605625861 has 2 divisors, whose sum is σ = 2605625862. Its totient is φ = 2605625860.

The previous prime is 2605625849. The next prime is 2605625873. The reversal of 2605625861 is 1685265062.

2605625861 = 36094² + 36095².

It is a balanced prime because it is at equal distance from previous prime (2605625849) and next prime (2605625873).

It can be written as a sum of positive squares in only one way, i.e., 1302849025 + 1302776836 = 36095^2 + 36094^2 .

It is a cyclic number.

It is not a de Polignac number, because 2605625861 - 2¹⁴ = 2605609477 is a prime.

It is a super-2 number, since 2×2605625861² = 13578572255023982642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2605625831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1302812930 + 1302812931.

It is an arithmetic number, because the mean of its divisors is an integer number (1302812931).

Almost surely, 2^2605625861 is an apocalyptic number.

2605625861 is the 36095-th centered square number.

It is an amenable number.

2605625861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2605625861 is an equidigital number, since it uses as much as digits as its factorization.

2605625861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 2605625861 is about 51045.3314319733. The cubic root of 2605625861 is about 1376.0599405803.

The spelling of 2605625861 in words is "two billion, six hundred five million, six hundred twenty-five thousand, eight hundred sixty-one".