645586685546 has 8 divisors (see below), whose sum is σ = 1056414576384. Its totient is φ = 293448493420.

The previous prime is 645586685453. The next prime is 645586685581.

It is a happy number.

645586685546 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14672424650 + ... + 14672424693.

It is an arithmetic number, because the mean of its divisors is an integer number (132051822048).

Almost surely, 2^645586685546 is an apocalyptic number.

645586685546 is a deficient number, since it is larger than the sum of its proper divisors (410827890838).

645586685546 is a wasteful number, since it uses less digits than its factorization.

645586685546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29344849356.

The product of its digits is 829440000, while the sum is 68.

The spelling of 645586685546 in words is "six hundred forty-five billion, five hundred eighty-six million, six hundred eighty-five thousand, five hundred forty-six".