220640664606 has 8 divisors (see below), whose sum is σ = 441281329224. Its totient is φ = 73546888200.

The previous prime is 220640664593. The next prime is 220640664637. The reversal of 220640664606 is 606466046022.

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

220640664606 is an admirable number.

It is a super-2 number, since 2×220640664606² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18386722045 + ... + 18386722056.

It is an arithmetic number, because the mean of its divisors is an integer number (55160166153).

Almost surely, 2^220640664606 is an apocalyptic number.

220640664606 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

220640664606 is a wasteful number, since it uses less digits than its factorization.

220640664606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36773444106.

The product of its (nonzero) digits is 497664, while the sum is 42.

The spelling of 220640664606 in words is "two hundred twenty billion, six hundred forty million, six hundred sixty-four thousand, six hundred six".