665556104 has 8 divisors (see below), whose sum is σ = 1247917710. Its totient is φ = 332778048.

The previous prime is 665556041. The next prime is 665556109. The reversal of 665556104 is 401655566.

It can be written as a sum of positive squares in only one way, i.e., 390062500 + 275493604 = 19750^2 + 16598^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (665556109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41597249 + ... + 41597264.

Almost surely, 2^665556104 is an apocalyptic number.

It is an amenable number.

665556104 is a deficient number, since it is larger than the sum of its proper divisors (582361606).

665556104 is a wasteful number, since it uses less digits than its factorization.

665556104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83194519 (or 83194515 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 665556104 is about 25798.3740572928. The cubic root of 665556104 is about 873.0951122040.

The spelling of 665556104 in words is "six hundred sixty-five million, five hundred fifty-six thousand, one hundred four".