66061550 has 24 divisors (see below), whose sum is σ = 123172176. Its totient is φ = 26360640.

The previous prime is 66061549. The next prime is 66061553. The reversal of 66061550 is 5516066.

66061550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66061553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22994 + ... + 25706.

It is an arithmetic number, because the mean of its divisors is an integer number (5132174).

Almost surely, 2^66061550 is an apocalyptic number.

66061550 is a deficient number, since it is larger than the sum of its proper divisors (57110626).

66061550 is a wasteful number, since it uses less digits than its factorization.

66061550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3212 (or 3207 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 66061550 is about 8127.8256625004. The cubic root of 66061550 is about 404.2495884465.

It can be divided in two parts, 66061 and 550, that multiplied together give a triangular number (36333550 = T₈₅₂₄).

The spelling of 66061550 in words is "sixty-six million, sixty-one thousand, five hundred fifty".