206121944358 has 24 divisors (see below), whose sum is σ = 487197323496. Its totient is φ = 62461195200.

The previous prime is 206121944323. The next prime is 206121944359. The reversal of 206121944358 is 853449121602.

206121944358 is a `hidden beast` number, since 2 + 0 + 6 + 121 + 94 + 435 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206121944359) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 520509763 + ... + 520510158.

It is an arithmetic number, because the mean of its divisors is an integer number (20299888479).

Almost surely, 2^206121944358 is an apocalyptic number.

206121944358 is an abundant number, since it is smaller than the sum of its proper divisors (281075379138).

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

206121944358 is a wasteful number, since it uses less digits than its factorization.

206121944358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041019940 (or 1041019937 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 206121944358 in words is "two hundred six billion, one hundred twenty-one million, nine hundred forty-four thousand, three hundred fifty-eight".