645434565340 has 12 divisors (see below), whose sum is σ = 1355412587256. Its totient is φ = 258173826128.

The previous prime is 645434565337. The next prime is 645434565371. The reversal of 645434565340 is 43565434546.

It is a congruent number.

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, 16135864114 + ... + 16135864153.

It is an arithmetic number, because the mean of its divisors is an integer number (112951048938).

Almost surely, 2^645434565340 is an apocalyptic number.

It is an amenable number.

645434565340 is an abundant number, since it is smaller than the sum of its proper divisors (709978021916).

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

645434565340 is a wasteful number, since it uses less digits than its factorization.

645434565340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32271728276 (or 32271728274 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 49.

Adding to 645434565340 its reverse (43565434546), we get a palindrome (688999999886).

The spelling of 645434565340 in words is "six hundred forty-five billion, four hundred thirty-four million, five hundred sixty-five thousand, three hundred forty".