53126666 has 16 divisors (see below), whose sum is σ = 87288840. Its totient is φ = 24138240.

The previous prime is 53126659. The next prime is 53126701. The reversal of 53126666 is 66662135.

It can be written as a sum of positive squares in 4 ways, for example, as 50708641 + 2418025 = 7121^2 + 1555^2 .

It is a super-4 number, since 4×53126666⁴ (a number of 32 digits) contains 4444 as substring.

53126666 is a modest number, since divided by 6666 gives 5312 as remainder.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25955 + ... + 27926.

Almost surely, 2^53126666 is an apocalyptic number.

53126666 is a deficient number, since it is larger than the sum of its proper divisors (34162174).

53126666 is a wasteful number, since it uses less digits than its factorization.

53126666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53929.

The product of its digits is 38880, while the sum is 35.

The square root of 53126666 is about 7288.8041543178. The cubic root of 53126666 is about 375.9275786654.

The spelling of 53126666 in words is "fifty-three million, one hundred twenty-six thousand, six hundred sixty-six".