210650660561 has 16 divisors (see below), whose sum is σ = 233998528320. Its totient is φ = 188010841920.

The previous prime is 210650660557. The next prime is 210650660581. The reversal of 210650660561 is 165066056012.

It is not a de Polignac number, because 210650660561 - 2² = 210650660557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210650660581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291731 + ... + 711623.

It is an arithmetic number, because the mean of its divisors is an integer number (14624908020).

Almost surely, 2^210650660561 is an apocalyptic number.

It is an amenable number.

210650660561 is a deficient number, since it is larger than the sum of its proper divisors (23347867759).

210650660561 is a wasteful number, since it uses less digits than its factorization.

210650660561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420736.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 210650660561 in words is "two hundred ten billion, six hundred fifty million, six hundred sixty thousand, five hundred sixty-one".