206511024040 has 16 divisors (see below), whose sum is σ = 464649804180. Its totient is φ = 82604409600.

The previous prime is 206511023897. The next prime is 206511024043. The reversal of 206511024040 is 40420115602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 174221090404 + 32289933636 = 417398^2 + 179694^2 .

It is a junction number, because it is equal to n+sod(n) for n = 206511023996 and 206511024014.

It is not an unprimeable number, because it can be changed into a prime (206511024043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2581387761 + ... + 2581387840.

Almost surely, 2^206511024040 is an apocalyptic number.

206511024040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206511024040 is an abundant number, since it is smaller than the sum of its proper divisors (258138780140).

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

206511024040 is a wasteful number, since it uses less digits than its factorization.

206511024040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5162775612 (or 5162775608 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 206511024040 its reverse (40420115602), we get a palindrome (246931139642).

The spelling of 206511024040 in words is "two hundred six billion, five hundred eleven million, twenty-four thousand, forty".