66240016 has 10 divisors (see below), whose sum is σ = 128340062. Its totient is φ = 33120000.

The previous prime is 66240001. The next prime is 66240017. The reversal of 66240016 is 61004266.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 38192400 + 28047616 = 6180^2 + 5296^2 .

It is not an unprimeable number, because it can be changed into a prime (66240017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2069985 + ... + 2070016.

Almost surely, 2^66240016 is an apocalyptic number.

It is an amenable number.

66240016 is a deficient number, since it is larger than the sum of its proper divisors (62100046).

66240016 is a wasteful number, since it uses less digits than its factorization.

66240016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4140009 (or 4140003 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 66240016 is about 8138.7969626966. The cubic root of 66240016 is about 404.6132893573.

The spelling of 66240016 in words is "sixty-six million, two hundred forty thousand, sixteen".