66020550 has 48 divisors (see below), whose sum is σ = 164520720. Its totient is φ = 17520640.

The previous prime is 66020519. The next prime is 66020551. The reversal of 66020550 is 5502066.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66020550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66020551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34006 + ... + 35894.

It is an arithmetic number, because the mean of its divisors is an integer number (3427515).

Almost surely, 2^66020550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66020550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82260360).

66020550 is an abundant number, since it is smaller than the sum of its proper divisors (98500170).

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

66020550 is a wasteful number, since it uses less digits than its factorization.

66020550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137 (or 2132 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 66020550 is about 8125.3030712706. The cubic root of 66020550 is about 404.1659408827.

The spelling of 66020550 in words is "sixty-six million, twenty thousand, five hundred fifty".