6777812655 has 12 divisors (see below), whose sum is σ = 11748208680. Its totient is φ = 3614833392.

The previous prime is 6777812641. The next prime is 6777812669. The reversal of 6777812655 is 5562187776.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6777812641) and next prime (6777812669).

It is not a de Polignac number, because 6777812655 - 2¹⁸ = 6777550511 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75308985 + ... + 75309074.

It is an arithmetic number, because the mean of its divisors is an integer number (979017390).

Almost surely, 2^6777812655 is an apocalyptic number.

6777812655 is a deficient number, since it is larger than the sum of its proper divisors (4970396025).

6777812655 is a wasteful number, since it uses less digits than its factorization.

6777812655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150618070 (or 150618067 counting only the distinct ones).

The product of its digits is 4939200, while the sum is 54.

The square root of 6777812655 is about 82327.4720552016. The cubic root of 6777812655 is about 1892.4737030468.

The spelling of 6777812655 in words is "six billion, seven hundred seventy-seven million, eight hundred twelve thousand, six hundred fifty-five".