664561110 has 32 divisors (see below), whose sum is σ = 1688768352. Its totient is φ = 166791680.

The previous prime is 664561109. The next prime is 664561111. The reversal of 664561110 is 11165466.

It is an interprime number because it is at equal distance from previous prime (664561109) and next prime (664561111).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664561111) 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, 651021 + ... + 652040.

It is an arithmetic number, because the mean of its divisors is an integer number (52774011).

Almost surely, 2^664561110 is an apocalyptic number.

664561110 is an abundant number, since it is smaller than the sum of its proper divisors (1024207242).

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

664561110 is a wasteful number, since it uses less digits than its factorization.

664561110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303088.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 664561110 is about 25779.0827998205. The cubic root of 664561110 is about 872.6598082220.

The spelling of 664561110 in words is "six hundred sixty-four million, five hundred sixty-one thousand, one hundred ten".