2645716969919 has 4 divisors (see below), whose sum is σ = 2663473459800. Its totient is φ = 2627960480040.

The previous prime is 2645716969901. The next prime is 2645716969981. The reversal of 2645716969919 is 9199696175462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2645716969919 is a prime.

It is a super-2 number, since 2×2645716969919² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645716963919) 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 3 ways as a sum of consecutive naturals, for example, 8878244717 + ... + 8878245014.

It is an arithmetic number, because the mean of its divisors is an integer number (665868364950).

Almost surely, 2^{2645716969919} is an apocalyptic number.

2645716969919 is a deficient number, since it is larger than the sum of its proper divisors (17756489881).

2645716969919 is a wasteful number, since it uses less digits than its factorization.

2645716969919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17756489880.

The product of its digits is 396809280, while the sum is 74.

The spelling of 2645716969919 in words is "two trillion, six hundred forty-five billion, seven hundred sixteen million, nine hundred sixty-nine thousand, nine hundred nineteen".