6647751061 has 6 divisors (see below), whose sum is σ = 7733098230. Its totient is φ = 5698072296.

The previous prime is 6647751053. The next prime is 6647751091. The reversal of 6647751061 is 1601577466.

It can be written as a sum of positive squares in only one way, i.e., 6135588900 + 512162161 = 78330^2 + 22631^2 .

It is not a de Polignac number, because 6647751061 - 2³ = 6647751053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6647750999 and 6647751017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6647751041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67834146 + ... + 67834243.

It is an arithmetic number, because the mean of its divisors is an integer number (1288849705).

Almost surely, 2^6647751061 is an apocalyptic number.

It is an amenable number.

6647751061 is a deficient number, since it is larger than the sum of its proper divisors (1085347169).

6647751061 is a wasteful number, since it uses less digits than its factorization.

6647751061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135668403 (or 135668396 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 6647751061 is about 81533.7418557495. The cubic root of 6647751061 is about 1880.2903449452.

The spelling of 6647751061 in words is "six billion, six hundred forty-seven million, seven hundred fifty-one thousand, sixty-one".