645304135006664 has 32 divisors (see below), whose sum is σ = 1383624086057280. Its totient is φ = 276393012794304.

The previous prime is 645304135006561. The next prime is 645304135006691. The reversal of 645304135006664 is 466600531403546.

It is a super-2 number, since 2×645304135006664² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3456201827 + ... + 3456388530.

It is an arithmetic number, because the mean of its divisors is an integer number (43238252689290).

Almost surely, 2^{645304135006664} is an apocalyptic number.

It is an amenable number.

645304135006664 is an abundant number, since it is smaller than the sum of its proper divisors (738319951050616).

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

645304135006664 is a wasteful number, since it uses less digits than its factorization.

645304135006664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6912592037 (or 6912592033 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 53.

The spelling of 645304135006664 in words is "six hundred forty-five trillion, three hundred four billion, one hundred thirty-five million, six thousand, six hundred sixty-four".