66155642 has 16 divisors (see below), whose sum is σ = 113514432.
Its totient is φ = 28326240.
The previous prime is 66155623. The next prime is 66155647. The reversal of 66155642 is 24655166.
It is not an unprimeable number, because it can be changed into a prime (66155647) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26717 + ... + 29087.
It is an arithmetic number, because the mean of its divisors is an integer number (7094652).
Almost surely, 266155642 is an apocalyptic number.
66155642 is a deficient number, since it is larger than the sum of its proper divisors (47358790).
66155642 is a wasteful number, since it uses less digits than its factorization.
66155642 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4373.
The product of its digits is 43200, while the sum is 35.
The square root of 66155642 is about 8133.6118668154.
The cubic root of 66155642 is about 404.4414227178.
The spelling of 66155642 in words is "sixty-six million, one hundred fifty-five thousand, six hundred forty-two".