206348475661 has 4 divisors (see below), whose sum is σ = 207854669052. Its totient is φ = 204842282272.

The previous prime is 206348475617. The next prime is 206348475713. The reversal of 206348475661 is 166574843602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157048934436 + 49299541225 = 396294^2 + 222035^2 .

It is a cyclic number.

It is not a de Polignac number, because 206348475661 - 2²³ = 206340087053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206348475599 and 206348475608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206348475611) 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, 753096490 + ... + 753096763.

It is an arithmetic number, because the mean of its divisors is an integer number (51963667263).

Almost surely, 2^206348475661 is an apocalyptic number.

It is an amenable number.

206348475661 is a deficient number, since it is larger than the sum of its proper divisors (1506193391).

206348475661 is a wasteful number, since it uses less digits than its factorization.

206348475661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506193390.

The product of its (nonzero) digits is 5806080, while the sum is 52.

The spelling of 206348475661 in words is "two hundred six billion, three hundred forty-eight million, four hundred seventy-five thousand, six hundred sixty-one".