2645815789 has 8 divisors (see below), whose sum is σ = 2662640640. Its totient is φ = 2629025616.

The previous prime is 2645815727. The next prime is 2645815811. The reversal of 2645815789 is 9875185462.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2645815789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645815709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153972 + ... + 170290.

It is an arithmetic number, because the mean of its divisors is an integer number (332830080).

Almost surely, 2^2645815789 is an apocalyptic number.

It is an amenable number.

2645815789 is a deficient number, since it is larger than the sum of its proper divisors (16824851).

2645815789 is a wasteful number, since it uses less digits than its factorization.

2645815789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17339.

The product of its digits is 4838400, while the sum is 55.

The square root of 2645815789 is about 51437.4939999997. The cubic root of 2645815789 is about 1383.0987896285.

The spelling of 2645815789 in words is "two billion, six hundred forty-five million, eight hundred fifteen thousand, seven hundred eighty-nine".