206322177938 has 6 divisors (see below), whose sum is σ = 309484230471. Its totient is φ = 103160767782.

The previous prime is 206322177913. The next prime is 206322177949. The reversal of 206322177938 is 839771223602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 103161088969 + 103161088969 = 321187^2 + 321187^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=321187.

It is a super-2 number, since 2×206322177938² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 481781 + ... + 802967.

Almost surely, 2^206322177938 is an apocalyptic number.

206322177938 is a deficient number, since it is larger than the sum of its proper divisors (103162052533).

206322177938 is an frugal number, since it uses more digits than its factorization.

206322177938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642376 (or 321189 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 50.

Multiplying 206322177938 by its sum of digits (50), we get a square (10316108896900 = 3211870²).

The spelling of 206322177938 in words is "two hundred six billion, three hundred twenty-two million, one hundred seventy-seven thousand, nine hundred thirty-eight".