66666650 has 48 divisors (see below), whose sum is σ = 133920000. Its totient is φ = 24615360.

The previous prime is 66666643. The next prime is 66666653. The reversal of 66666650 is 5666666.

66666650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66666598 and 66666607.

It is not an unprimeable number, because it can be changed into a prime (66666653) 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 23 ways as a sum of consecutive naturals, for example, 32351 + ... + 34349.

It is an arithmetic number, because the mean of its divisors is an integer number (2790000).

Almost surely, 2^66666650 is an apocalyptic number.

66666650 is an abundant number, since it is smaller than the sum of its proper divisors (67253350).

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

66666650 is a wasteful number, since it uses less digits than its factorization.

66666650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063 (or 2058 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 41.

The square root of 66666650 is about 8164.9647886565. The cubic root of 66666650 is about 405.4800992482.

The spelling of 66666650 in words is "sixty-six million, six hundred sixty-six thousand, six hundred fifty".