6644577785471 has 8 divisors (see below), whose sum is σ = 6646528818864. Its totient is φ = 6642626985280.

The previous prime is 6644577785387. The next prime is 6644577785473. The reversal of 6644577785471 is 1745877754466.

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-6644577785471 is a prime.

It is a super-3 number, since 3×6644577785471³ (a number of 39 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6644577785395 and 6644577785404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644577785473) 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, 68282411 + ... + 68379651.

It is an arithmetic number, because the mean of its divisors is an integer number (830816102358).

Almost surely, 2^{6644577785471} is an apocalyptic number.

6644577785471 is a deficient number, since it is larger than the sum of its proper divisors (1951033393).

6644577785471 is a wasteful number, since it uses less digits than its factorization.

6644577785471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116601.

The product of its digits is 1106380800, while the sum is 71.

The spelling of 6644577785471 in words is "six trillion, six hundred forty-four billion, five hundred seventy-seven million, seven hundred eighty-five thousand, four hundred seventy-one".