643360565340 has 36 divisors (see below), whose sum is σ = 1951527048744. Its totient is φ = 171562817376.

The previous prime is 643360565327. The next prime is 643360565357. The reversal of 643360565340 is 43565063346.

643360565340 is a `hidden beast` number, since 6 + 4 + 3 + 3 + 60 + 56 + 534 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1787112502 + ... + 1787112861.

Almost surely, 2^643360565340 is an apocalyptic number.

643360565340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643360565340 is an abundant number, since it is smaller than the sum of its proper divisors (1308166483404).

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

643360565340 is a wasteful number, since it uses less digits than its factorization.

643360565340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3574225378 (or 3574225373 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 45.

The spelling of 643360565340 in words is "six hundred forty-three billion, three hundred sixty million, five hundred sixty-five thousand, three hundred forty".