66187144 has 16 divisors (see below), whose sum is σ = 126205200. Its totient is φ = 32532432.

The previous prime is 66187111. The next prime is 66187157. The reversal of 66187144 is 44178166.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69642 + ... + 70585.

It is an arithmetic number, because the mean of its divisors is an integer number (7887825).

Almost surely, 2^66187144 is an apocalyptic number.

It is an amenable number.

66187144 is a deficient number, since it is larger than the sum of its proper divisors (60018056).

66187144 is a wasteful number, since it uses less digits than its factorization.

66187144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140292 (or 140288 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 66187144 is about 8135.5481683781. The cubic root of 66187144 is about 404.5056081828.

The spelling of 66187144 in words is "sixty-six million, one hundred eighty-seven thousand, one hundred forty-four".