2645644187769 has 8 divisors (see below), whose sum is σ = 3848209727712. Its totient is φ = 1603420719840.

The previous prime is 2645644187759. The next prime is 2645644187783. The reversal of 2645644187769 is 9677814465462.

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

It is not a de Polignac number, because 2645644187769 - 2⁵ = 2645644187737 is a prime.

It is a super-2 number, since 2×2645644187769² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2645644187759) 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, 40085517964 + ... + 40085518029.

It is an arithmetic number, because the mean of its divisors is an integer number (481026215964).

Almost surely, 2^{2645644187769} is an apocalyptic number.

It is an amenable number.

2645644187769 is a deficient number, since it is larger than the sum of its proper divisors (1202565539943).

2645644187769 is a wasteful number, since it uses less digits than its factorization.

2645644187769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80171036007.

The product of its digits is 487710720, while the sum is 69.

The spelling of 2645644187769 in words is "two trillion, six hundred forty-five billion, six hundred forty-four million, one hundred eighty-seven thousand, seven hundred sixty-nine".