6777221265 has 32 divisors (see below), whose sum is σ = 12463862400. Its totient is φ = 3489877440.

The previous prime is 6777221257. The next prime is 6777221267. The reversal of 6777221265 is 5621227776.

It is not a de Polignac number, because 6777221265 - 2³ = 6777221257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6777221265.

It is not an unprimeable number, because it can be changed into a prime (6777221267) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 861631 + ... + 869460.

It is an arithmetic number, because the mean of its divisors is an integer number (389495700).

Almost surely, 2^6777221265 is an apocalyptic number.

It is an amenable number.

6777221265 is a deficient number, since it is larger than the sum of its proper divisors (5686641135).

6777221265 is a wasteful number, since it uses less digits than its factorization.

6777221265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731134 (or 1731128 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 6777221265 is about 82323.8802839128. The cubic root of 6777221265 is about 1892.4186595968.

The spelling of 6777221265 in words is "six billion, seven hundred seventy-seven million, two hundred twenty-one thousand, two hundred sixty-five".