6440787733671 has 12 divisors (see below), whose sum is σ = 9399270989472. Its totient is φ = 4249591906176.

The previous prime is 6440787733631. The next prime is 6440787733717. The reversal of 6440787733671 is 1763377870446.

It is a happy number.

6440787733671 is a `hidden beast` number, since 64 + 40 + 78 + 77 + 336 + 71 = 666.

It is not a de Polignac number, because 6440787733671 - 2⁶ = 6440787733607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6440787733599 and 6440787733608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440787733631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3688880991 + ... + 3688882736.

It is an arithmetic number, because the mean of its divisors is an integer number (783272582456).

Almost surely, 2^{6440787733671} is an apocalyptic number.

6440787733671 is a deficient number, since it is larger than the sum of its proper divisors (2958483255801).

6440787733671 is a wasteful number, since it uses less digits than its factorization.

6440787733671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7377763830 (or 7377763827 counting only the distinct ones).

The product of its (nonzero) digits is 99574272, while the sum is 63.

The spelling of 6440787733671 in words is "six trillion, four hundred forty billion, seven hundred eighty-seven million, seven hundred thirty-three thousand, six hundred seventy-one".