206942456447999 has 4 divisors (see below), whose sum is σ = 206942525448120. Its totient is φ = 206942387447880.

The previous prime is 206942456447833. The next prime is 206942456448011. The reversal of 206942456447999 is 999744654249602.

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 206942456447999 - 2¹² = 206942456443903 is a prime.

It is a super-2 number, since 2×206942456447999² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206942456447399) 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, 29786672 + ... + 36071189.

It is an arithmetic number, because the mean of its divisors is an integer number (51735631362030).

Almost surely, 2^{206942456447999} is an apocalyptic number.

206942456447999 is a deficient number, since it is larger than the sum of its proper divisors (69000121).

206942456447999 is an equidigital number, since it uses as much as digits as its factorization.

206942456447999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69000120.

The product of its (nonzero) digits is 8465264640, while the sum is 80.

The spelling of 206942456447999 in words is "two hundred six trillion, nine hundred forty-two billion, four hundred fifty-six million, four hundred forty-seven thousand, nine hundred ninety-nine".