66551650 has 48 divisors (see below), whose sum is σ = 140937408. Its totient is φ = 23144000.

The previous prime is 66551647. The next prime is 66551657. The reversal of 66551650 is 5615566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66551657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10020 + ... + 15280.

It is an arithmetic number, because the mean of its divisors is an integer number (2936196).

Almost surely, 2^66551650 is an apocalyptic number.

66551650 is an abundant number, since it is smaller than the sum of its proper divisors (74385758).

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

66551650 is a wasteful number, since it uses less digits than its factorization.

66551650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5307 (or 5302 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 66551650 is about 8157.9194651578. The cubic root of 66551650 is about 405.2468139423.

It can be divided in two parts, 665516 and 50, that added together give a palindrome (665566).

The spelling of 66551650 in words is "sixty-six million, five hundred fifty-one thousand, six hundred fifty".