665151663 has 16 divisors (see below), whose sum is σ = 983894400. Its totient is φ = 396288480.

The previous prime is 665151647. The next prime is 665151709. The reversal of 665151663 is 366151566.

It is not a de Polignac number, because 665151663 - 2⁴ = 665151647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665151863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168868 + ... + 172761.

It is an arithmetic number, because the mean of its divisors is an integer number (61493400).

Almost surely, 2^665151663 is an apocalyptic number.

665151663 is a deficient number, since it is larger than the sum of its proper divisors (318742737).

665151663 is a wasteful number, since it uses less digits than its factorization.

665151663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341702.

The product of its digits is 97200, while the sum is 39.

The square root of 665151663 is about 25790.5343682522. The cubic root of 665151663 is about 872.9182240305.

The spelling of 665151663 in words is "six hundred sixty-five million, one hundred fifty-one thousand, six hundred sixty-three".