665984055 has 32 divisors (see below), whose sum is σ = 1174457088. Its totient is φ = 319564800.

The previous prime is 665984023. The next prime is 665984057. The reversal of 665984055 is 550489566.

It is not a de Polignac number, because 665984055 - 2⁵ = 665984023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665983995 and 665984013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665984057) 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, 4801 + ... + 36810.

It is an arithmetic number, because the mean of its divisors is an integer number (36701784).

Almost surely, 2^665984055 is an apocalyptic number.

665984055 is a deficient number, since it is larger than the sum of its proper divisors (508473033).

665984055 is a wasteful number, since it uses less digits than its factorization.

665984055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41727.

The product of its (nonzero) digits is 1296000, while the sum is 48.

The square root of 665984055 is about 25806.6668711789. Note that the first 3 decimals coincide. The cubic root of 665984055 is about 873.2822048068.

The spelling of 665984055 in words is "six hundred sixty-five million, nine hundred eighty-four thousand, fifty-five".