66521126 has 24 divisors (see below), whose sum is σ = 116658936. Its totient is φ = 28365120.

The previous prime is 66521113. The next prime is 66521137. The reversal of 66521126 is 62112566.

66521126 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 an unprimeable number.

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, 19070 + ... + 22286.

It is an arithmetic number, because the mean of its divisors is an integer number (4860789).

Almost surely, 2^66521126 is an apocalyptic number.

66521126 is a deficient number, since it is larger than the sum of its proper divisors (50137810).

66521126 is a wasteful number, since it uses less digits than its factorization.

66521126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444 (or 3437 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 66521126 is about 8156.0484304594. The cubic root of 66521126 is about 405.1848488101.

The spelling of 66521126 in words is "sixty-six million, five hundred twenty-one thousand, one hundred twenty-six".