20150506566 has 80 divisors (see below), whose sum is σ = 47172605040. Its totient is φ = 6420859200.

The previous prime is 20150506559. The next prime is 20150506603. The reversal of 20150506566 is 66560505102.

It is a happy number.

It is a super-2 number, since 2×20150506566² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20150506566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 453265 + ... + 495731.

It is an arithmetic number, because the mean of its divisors is an integer number (589657563).

Almost surely, 2^20150506566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20150506566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23586302520).

20150506566 is an abundant number, since it is smaller than the sum of its proper divisors (27022098474).

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

20150506566 is a wasteful number, since it uses less digits than its factorization.

20150506566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42611 (or 42602 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 20150506566 in words is "twenty billion, one hundred fifty million, five hundred six thousand, five hundred sixty-six".