6647766141 has 4 divisors (see below), whose sum is σ = 8863688192. Its totient is φ = 4431844092.

The previous prime is 6647766131. The next prime is 6647766187. The reversal of 6647766141 is 1416677466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-6647766141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6647766101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1107961021 + ... + 1107961026.

It is an arithmetic number, because the mean of its divisors is an integer number (2215922048).

Almost surely, 2^6647766141 is an apocalyptic number.

It is an amenable number.

6647766141 is a deficient number, since it is larger than the sum of its proper divisors (2215922051).

6647766141 is a wasteful number, since it uses less digits than its factorization.

6647766141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215922050.

The product of its digits is 1016064, while the sum is 48.

The square root of 6647766141 is about 81533.8343327480. The cubic root of 6647766141 is about 1880.2917667171.

The spelling of 6647766141 in words is "six billion, six hundred forty-seven million, seven hundred sixty-six thousand, one hundred forty-one".