6855177640 has 16 divisors (see below), whose sum is σ = 15424149780. Its totient is φ = 2742071040.

The previous prime is 6855177629. The next prime is 6855177649. The reversal of 6855177640 is 467715586.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5577401124 + 1277776516 = 74682^2 + 35746^2 .

It is not an unprimeable number, because it can be changed into a prime (6855177649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85689681 + ... + 85689760.

Almost surely, 2^6855177640 is an apocalyptic number.

It is an amenable number.

6855177640 is an abundant number, since it is smaller than the sum of its proper divisors (8568972140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6855177640 is a wasteful number, since it uses less digits than its factorization.

6855177640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171379452 (or 171379448 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 49.

The square root of 6855177640 is about 82796.0001449345. Note that the first 3 decimals coincide. The cubic root of 6855177640 is about 1899.6469925894.

The spelling of 6855177640 in words is "six billion, eight hundred fifty-five million, one hundred seventy-seven thousand, six hundred forty".