20116621066 has 8 divisors (see below), whose sum is σ = 30473693604. Its totient is φ = 9958723200.

The previous prime is 20116621027. The next prime is 20116621069. The reversal of 20116621066 is 66012661102.

It can be written as a sum of positive squares in 2 ways, for example, as 14405040441 + 5711580625 = 120021^2 + 75575^2 .

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

It is a super-2 number, since 2×20116621066² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20116621069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49793415 + ... + 49793818.

Almost surely, 2^20116621066 is an apocalyptic number.

20116621066 is a deficient number, since it is larger than the sum of its proper divisors (10357072538).

20116621066 is a wasteful number, since it uses less digits than its factorization.

20116621066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99587336.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 20116621066 in words is "twenty billion, one hundred sixteen million, six hundred twenty-one thousand, sixty-six".