206481716761 has 4 divisors (see below), whose sum is σ = 206482830372. Its totient is φ = 206480603152.

The previous prime is 206481716737. The next prime is 206481716783. The reversal of 206481716761 is 167617184602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 149923840000 + 56557876761 = 387200^2 + 237819^2 .

It is a cyclic number.

It is not a de Polignac number, because 206481716761 - 2⁷ = 206481716633 is a prime.

It is a super-2 number, since 2×206481716761² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206481716711) 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, 204286 + ... + 674311.

It is an arithmetic number, because the mean of its divisors is an integer number (51620707593).

Almost surely, 2^206481716761 is an apocalyptic number.

It is an amenable number.

206481716761 is a deficient number, since it is larger than the sum of its proper divisors (1113611).

206481716761 is an equidigital number, since it uses as much as digits as its factorization.

206481716761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113610.

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 206481716761 in words is "two hundred six billion, four hundred eighty-one million, seven hundred sixteen thousand, seven hundred sixty-one".