665671055 has 16 divisors (see below), whose sum is σ = 913343040. Its totient is φ = 456248832.

The previous prime is 665671049. The next prime is 665671067. The reversal of 665671055 is 550176566.

It is a cyclic number.

It is not a de Polignac number, because 665671055 - 2¹² = 665666959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130391 + ... + 135399.

It is an arithmetic number, because the mean of its divisors is an integer number (57083940).

Almost surely, 2^665671055 is an apocalyptic number.

665671055 is a deficient number, since it is larger than the sum of its proper divisors (247671985).

665671055 is a wasteful number, since it uses less digits than its factorization.

665671055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8818.

The product of its (nonzero) digits is 189000, while the sum is 41.

The square root of 665671055 is about 25800.6018340658. The cubic root of 665671055 is about 873.1453746227.

The spelling of 665671055 in words is "six hundred sixty-five million, six hundred seventy-one thousand, fifty-five".