665564622 has 16 divisors (see below), whose sum is σ = 1332210000. Its totient is φ = 221674752.

The previous prime is 665564617. The next prime is 665564657. The reversal of 665564622 is 226465566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36913 + ... + 51900.

It is an arithmetic number, because the mean of its divisors is an integer number (83263125).

Almost surely, 2^665564622 is an apocalyptic number.

665564622 is an abundant number, since it is smaller than the sum of its proper divisors (666645378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665564622 is a wasteful number, since it uses less digits than its factorization.

665564622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90067.

The product of its digits is 518400, while the sum is 42.

The square root of 665564622 is about 25798.5391446880. The cubic root of 665564622 is about 873.0988369050.

The spelling of 665564622 in words is "six hundred sixty-five million, five hundred sixty-four thousand, six hundred twenty-two".