6771512645 has 16 divisors (see below), whose sum is σ = 8327137392. Its totient is φ = 5283095040.

The previous prime is 6771512603. The next prime is 6771512653. The reversal of 6771512645 is 5462151776.

It can be written as a sum of positive squares in 8 ways, for example, as 66031876 + 6705480769 = 8126^2 + 81887^2 .

It is not a de Polignac number, because 6771512645 - 2⁸ = 6771512389 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6771512596 and 6771512605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 785579 + ... + 794151.

It is an arithmetic number, because the mean of its divisors is an integer number (520446087).

Almost surely, 2^6771512645 is an apocalyptic number.

It is an amenable number.

6771512645 is a deficient number, since it is larger than the sum of its proper divisors (1555624747).

6771512645 is a wasteful number, since it uses less digits than its factorization.

6771512645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12472.

The product of its digits is 352800, while the sum is 44.

The square root of 6771512645 is about 82289.2012660227. The cubic root of 6771512645 is about 1891.8871667600.

The spelling of 6771512645 in words is "six billion, seven hundred seventy-one million, five hundred twelve thousand, six hundred forty-five".