664185581466 has 32 divisors (see below), whose sum is σ = 1463480035776. Its totient is φ = 199275600000.

The previous prime is 664185581441. The next prime is 664185581561.

It is a happy number.

664185581466 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×664185581466² (a number of 24 digits) contains 22 as substring.

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, 49812235 + ... + 49825566.

It is an arithmetic number, because the mean of its divisors is an integer number (45733751118).

Almost surely, 2^664185581466 is an apocalyptic number.

664185581466 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

664185581466 is an abundant number, since it is smaller than the sum of its proper divisors (799294454310).

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

664185581466 is a wasteful number, since it uses less digits than its factorization.

664185581466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99637918.

The product of its digits is 33177600, while the sum is 60.

The spelling of 664185581466 in words is "six hundred sixty-four billion, one hundred eighty-five million, five hundred eighty-one thousand, four hundred sixty-six".