645466664546 has 8 divisors (see below), whose sum is σ = 1056218178384. Its totient is φ = 293393938420.

The previous prime is 645466664497. The next prime is 645466664551.

645466664546 is nontrivially palindromic in base 10.

645466664546 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×645466664546² (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 3 ways as a sum of consecutive naturals, for example, 14669696900 + ... + 14669696943.

It is an arithmetic number, because the mean of its divisors is an integer number (132027272298).

Almost surely, 2^645466664546 is an apocalyptic number.

645466664546 is a deficient number, since it is larger than the sum of its proper divisors (410751513838).

645466664546 is a wasteful number, since it uses less digits than its factorization.

645466664546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29339393856.

The product of its digits is 298598400, while the sum is 62.

The spelling of 645466664546 in words is "six hundred forty-five billion, four hundred sixty-six million, six hundred sixty-four thousand, five hundred forty-six".