206213487621959 has 4 divisors (see below), whose sum is σ = 206219749261416. Its totient is φ = 206207225982504.

The previous prime is 206213487621937. The next prime is 206213487621979. The reversal of 206213487621959 is 959126784312602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206213487621959 - 2³⁶ = 206144768145223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206213487621895 and 206213487621904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206213487621919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3130770329 + ... + 3130836194.

It is an arithmetic number, because the mean of its divisors is an integer number (51554937315354).

It is a 1-persistent number, because it is pandigital, but 2⋅206213487621959 = 412426975243918 is not.

Almost surely, 2^{206213487621959} is an apocalyptic number.

206213487621959 is a deficient number, since it is larger than the sum of its proper divisors (6261639457).

206213487621959 is an equidigital number, since it uses as much as digits as its factorization.

206213487621959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6261639456.

The product of its (nonzero) digits is 78382080, while the sum is 65.

The spelling of 206213487621959 in words is "two hundred six trillion, two hundred thirteen billion, four hundred eighty-seven million, six hundred twenty-one thousand, nine hundred fifty-nine".