20211567066 has 64 divisors (see below), whose sum is σ = 45811059840. Its totient is φ = 6602993280.

The previous prime is 20211567043. The next prime is 20211567071. The reversal of 20211567066 is 66076511202.

It is a happy number.

20211567066 is a `hidden beast` number, since 20 + 2 + 11 + 567 + 0 + 66 = 666.

It is a super-4 number, since 4×20211567066⁴ (a number of 42 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20211567066.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3119206 + ... + 3125678.

It is an arithmetic number, because the mean of its divisors is an integer number (715797810).

Almost surely, 2^20211567066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20211567066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22905529920).

20211567066 is an abundant number, since it is smaller than the sum of its proper divisors (25599492774).

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

20211567066 is a wasteful number, since it uses less digits than its factorization.

20211567066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7628 (or 7622 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 20211567066 in words is "twenty billion, two hundred eleven million, five hundred sixty-seven thousand, sixty-six".