66666662 has 4 divisors (see below), whose sum is σ = 99999996. Its totient is φ = 33333330.

The previous prime is 66666653. The next prime is 66666667. The reversal of 66666662 is 26666666.

66666662 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666667) 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 as a sum of consecutive naturals, namely, 16666664 + ... + 16666667.

It is an arithmetic number, because the mean of its divisors is an integer number (24999999).

Almost surely, 2^66666662 is an apocalyptic number.

66666662 is a deficient number, since it is larger than the sum of its proper divisors (33333334).

66666662 is a wasteful number, since it uses less digits than its factorization.

66666662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33333333.

The product of its digits is 559872, while the sum is 44.

The square root of 66666662 is about 8164.9655235035. The cubic root of 66666662 is about 405.4801235770.

The spelling of 66666662 in words is "sixty-six million, six hundred sixty-six thousand, six hundred sixty-two".