643114265540 has 12 divisors (see below), whose sum is σ = 1350539957676. Its totient is φ = 257245706208.

The previous prime is 643114265537. The next prime is 643114265581. The reversal of 643114265540 is 45562411346.

It can be written as a sum of positive squares in 2 ways, for example, as 87624288196 + 555489977344 = 296014^2 + 745312^2 .

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, 16077856619 + ... + 16077856658.

It is an arithmetic number, because the mean of its divisors is an integer number (112544996473).

Almost surely, 2^643114265540 is an apocalyptic number.

It is an amenable number.

643114265540 is an abundant number, since it is smaller than the sum of its proper divisors (707425692136).

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

643114265540 is a wasteful number, since it uses less digits than its factorization.

643114265540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32155713286 (or 32155713284 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 41.

Adding to 643114265540 its reverse (45562411346), we get a palindrome (688676676886).

The spelling of 643114265540 in words is "six hundred forty-three billion, one hundred fourteen million, two hundred sixty-five thousand, five hundred forty".