205611216330 has 64 divisors (see below), whose sum is σ = 540433192320. Its totient is φ = 49754155776.

The previous prime is 205611216329. The next prime is 205611216331. The reversal of 205611216330 is 33612116502.

It is an interprime number because it is at equal distance from previous prime (205611216329) and next prime (205611216331).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (205611216331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4444857 + ... + 4490876.

It is an arithmetic number, because the mean of its divisors is an integer number (8444268630).

Almost surely, 2^205611216330 is an apocalyptic number.

205611216330 is an abundant number, since it is smaller than the sum of its proper divisors (334821975990).

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

205611216330 is a wasteful number, since it uses less digits than its factorization.

205611216330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8935815.

The product of its (nonzero) digits is 6480, while the sum is 30.

The spelling of 205611216330 in words is "two hundred five billion, six hundred eleven million, two hundred sixteen thousand, three hundred thirty".