66017440 has 24 divisors (see below), whose sum is σ = 155966580. Its totient is φ = 26406912.

The previous prime is 66017417. The next prime is 66017531. The reversal of 66017440 is 4471066.

It can be written as a sum of positive squares in 2 ways, for example, as 65221776 + 795664 = 8076^2 + 892^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66017399 and 66017408.

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, 206145 + ... + 206464.

Almost surely, 2^66017440 is an apocalyptic number.

It is an amenable number.

66017440 is an abundant number, since it is smaller than the sum of its proper divisors (89949140).

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

66017440 is a wasteful number, since it uses less digits than its factorization.

66017440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412624 (or 412616 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 66017440 is about 8125.1116915400. Note that the first 3 decimals coincide. The cubic root of 66017440 is about 404.1595944961.

It can be divided in two parts, 6601 and 7440, that added together give a palindrome (14041).

The spelling of 66017440 in words is "sixty-six million, seventeen thousand, four hundred forty".