20661216602 has 8 divisors (see below), whose sum is σ = 33375811476. Its totient is φ = 9535946112.

The previous prime is 20661216581. The next prime is 20661216613.

20661216602 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 20332193281 + 329023321 = 142591^2 + 18139^2 .

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

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, 397331063 + ... + 397331114.

Almost surely, 2^20661216602 is an apocalyptic number.

20661216602 is a deficient number, since it is larger than the sum of its proper divisors (12714594874).

20661216602 is a wasteful number, since it uses less digits than its factorization.

20661216602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794662192.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 20661216602 in words is "twenty billion, six hundred sixty-one million, two hundred sixteen thousand, six hundred two".