2645869989 has 16 divisors (see below), whose sum is σ = 4045571712. Its totient is φ = 1506762048.

The previous prime is 2645869939. The next prime is 2645870039. The reversal of 2645869989 is 9899685462.

It is an interprime number because it is at equal distance from previous prime (2645869939) and next prime (2645870039).

It is not a de Polignac number, because 2645869989 - 2²¹ = 2643772837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645869939) 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 in 15 ways as a sum of consecutive naturals, for example, 208854 + ... + 221159.

It is an arithmetic number, because the mean of its divisors is an integer number (252848232).

Almost surely, 2^2645869989 is an apocalyptic number.

It is an amenable number.

2645869989 is a deficient number, since it is larger than the sum of its proper divisors (1399701723).

2645869989 is a wasteful number, since it uses less digits than its factorization.

2645869989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430316.

The product of its digits is 67184640, while the sum is 66.

The square root of 2645869989 is about 51438.0208503399. The cubic root of 2645869989 is about 1383.1082339044.

The spelling of 2645869989 in words is "two billion, six hundred forty-five million, eight hundred sixty-nine thousand, nine hundred eighty-nine".