6647969775 has 24 divisors (see below), whose sum is σ = 10995935104. Its totient is φ = 3544092000.

The previous prime is 6647969761. The next prime is 6647969789. The reversal of 6647969775 is 5779697466.

It is an interprime number because it is at equal distance from previous prime (6647969761) and next prime (6647969789).

It is not a de Polignac number, because 6647969775 - 2⁶ = 6647969711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 173952 + ... + 208698.

Almost surely, 2^6647969775 is an apocalyptic number.

6647969775 is a deficient number, since it is larger than the sum of its proper divisors (4347965329).

6647969775 is a wasteful number, since it uses less digits than its factorization.

6647969775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37311 (or 37306 counting only the distinct ones).

The product of its digits is 120022560, while the sum is 66.

The square root of 6647969775 is about 81535.0830931078. The cubic root of 6647969775 is about 1880.3109655184.

The spelling of 6647969775 in words is "six billion, six hundred forty-seven million, nine hundred sixty-nine thousand, seven hundred seventy-five".