206874819919 has 2 divisors, whose sum is σ = 206874819920. Its totient is φ = 206874819918.

The previous prime is 206874819887. The next prime is 206874820043. The reversal of 206874819919 is 919918478602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206874819919 - 2⁵ = 206874819887 is a prime.

It is a super-2 number, since 2×206874819919² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206874811919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103437409959 + 103437409960.

It is an arithmetic number, because the mean of its divisors is an integer number (103437409960).

Almost surely, 2^206874819919 is an apocalyptic number.

206874819919 is a deficient number, since it is larger than the sum of its proper divisors (1).

206874819919 is an equidigital number, since it uses as much as digits as its factorization.

206874819919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15676416, while the sum is 64.

The spelling of 206874819919 in words is "two hundred six billion, eight hundred seventy-four million, eight hundred nineteen thousand, nine hundred nineteen".