66156222 has 32 divisors (see below), whose sum is σ = 148247424. Its totient is φ = 19504800.

The previous prime is 66156191. The next prime is 66156227. The reversal of 66156222 is 22265166.

It is a self number, because there is not a number n which added to its sum of digits gives 66156222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66156227) 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, 11104 + ... + 15987.

It is an arithmetic number, because the mean of its divisors is an integer number (4632732).

Almost surely, 2^66156222 is an apocalyptic number.

66156222 is an abundant number, since it is smaller than the sum of its proper divisors (82091202).

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

66156222 is a wasteful number, since it uses less digits than its factorization.

66156222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27144.

The product of its digits is 8640, while the sum is 30.

The square root of 66156222 is about 8133.6475212539. The cubic root of 66156222 is about 404.4426046545.

The spelling of 66156222 in words is "sixty-six million, one hundred fifty-six thousand, two hundred twenty-two".