665000000055 has 24 divisors (see below), whose sum is σ = 1189849464960. Its totient is φ = 343225805760.

The previous prime is 665000000051. The next prime is 665000000081. The reversal of 665000000055 is 550000000566.

665000000055 is a `hidden beast` number, since 6 + 650 + 0 + 0 + 0 + 0 + 0 + 0 + 5 + 5 = 666.

It is not a de Polignac number, because 665000000055 - 2² = 665000000051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664999999965 and 665000000028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665000000051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238349860 + ... + 238352649.

It is an arithmetic number, because the mean of its divisors is an integer number (49577061040).

Almost surely, 2^665000000055 is an apocalyptic number.

665000000055 is a deficient number, since it is larger than the sum of its proper divisors (524849464905).

665000000055 is a wasteful number, since it uses less digits than its factorization.

665000000055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476702551 (or 476702548 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The spelling of 665000000055 in words is "six hundred sixty-five billion, fifty-five", and thus it is an aban number.