66061566 has 24 divisors (see below), whose sum is σ = 149357520. Its totient is φ = 21062976.

The previous prime is 66061553. The next prime is 66061571. The reversal of 66061566 is 66516066.

It is a self number, because there is not a number n which added to its sum of digits gives 66061566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79371 + ... + 80198.

It is an arithmetic number, because the mean of its divisors is an integer number (6223230).

Almost surely, 2^66061566 is an apocalyptic number.

66061566 is an abundant number, since it is smaller than the sum of its proper divisors (83295954).

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

66061566 is a wasteful number, since it uses less digits than its factorization.

66061566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159600 (or 159597 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 66061566 is about 8127.8266467734. The cubic root of 66061566 is about 404.2496210827.

It can be divided in two parts, 660 and 61566, that added together give a palindrome (62226).

The spelling of 66061566 in words is "sixty-six million, sixty-one thousand, five hundred sixty-six".