205867799340 has 72 divisors (see below), whose sum is σ = 670540841712. Its totient is φ = 47055496320.

The previous prime is 205867799339. The next prime is 205867799351. The reversal of 205867799340 is 43997768502.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35008591 + ... + 35014470.

It is an arithmetic number, because the mean of its divisors is an integer number (9313067246).

Almost surely, 2^205867799340 is an apocalyptic number.

205867799340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205867799340 is an abundant number, since it is smaller than the sum of its proper divisors (464673042372).

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

205867799340 is a wasteful number, since it uses less digits than its factorization.

205867799340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70023087 (or 70023078 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 60.

The spelling of 205867799340 in words is "two hundred five billion, eight hundred sixty-seven million, seven hundred ninety-nine thousand, three hundred forty".