640206543120 has 80 divisors (see below), whose sum is σ = 1986562292352. Its totient is φ = 170556410880.

The previous prime is 640206543103. The next prime is 640206543121. The reversal of 640206543120 is 21345602046.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (640206543121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1043236 + ... + 1539075.

Almost surely, 2^640206543120 is an apocalyptic number.

640206543120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640206543120 is an abundant number, since it is smaller than the sum of its proper divisors (1346355749232).

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

640206543120 is a wasteful number, since it uses less digits than its factorization.

640206543120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583360 (or 2583354 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 640206543120 in words is "six hundred forty billion, two hundred six million, five hundred forty-three thousand, one hundred twenty".