66666622 has 32 divisors (see below), whose sum is σ = 116056800. Its totient is φ = 28385280.

The previous prime is 66666569. The next prime is 66666629. The reversal of 66666622 is 22666666.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148254 + ... + 148702.

It is an arithmetic number, because the mean of its divisors is an integer number (3626775).

It is a self-describing number.

Almost surely, 2^66666622 is an apocalyptic number.

66666622 is a deficient number, since it is larger than the sum of its proper divisors (49390178).

66666622 is a wasteful number, since it uses less digits than its factorization.

66666622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876.

The product of its digits is 186624, while the sum is 40.

The square root of 66666622 is about 8164.9630740133. The cubic root of 66666622 is about 405.4800424810.

The spelling of 66666622 in words is "sixty-six million, six hundred sixty-six thousand, six hundred twenty-two".