206521150661 has 8 divisors (see below), whose sum is σ = 236308888320. Its totient is φ = 176804592048.

The previous prime is 206521150601. The next prime is 206521150669. The reversal of 206521150661 is 166051125602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-206521150661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206521150669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17788541 + ... + 17800146.

It is an arithmetic number, because the mean of its divisors is an integer number (29538611040).

Almost surely, 2^206521150661 is an apocalyptic number.

It is an amenable number.

206521150661 is a deficient number, since it is larger than the sum of its proper divisors (29787737659).

206521150661 is an equidigital number, since it uses as much as digits as its factorization.

206521150661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35589523.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 206521150661 in words is "two hundred six billion, five hundred twenty-one million, one hundred fifty thousand, six hundred sixty-one".