66539344 has 20 divisors (see below), whose sum is σ = 129155796. Its totient is φ = 33208832.

The previous prime is 66539329. The next prime is 66539353. The reversal of 66539344 is 44393566.

It can be written as a sum of positive squares in 2 ways, for example, as 49000000 + 17539344 = 7000^2 + 4188^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66539297 and 66539306.

It is a congruent 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, 5982 + ... + 12994.

Almost surely, 2^66539344 is an apocalyptic number.

It is an amenable number.

66539344 is a deficient number, since it is larger than the sum of its proper divisors (62616452).

66539344 is a wasteful number, since it uses less digits than its factorization.

66539344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7614 (or 7608 counting only the distinct ones).

The product of its digits is 233280, while the sum is 40.

The square root of 66539344 is about 8157.1651938648. The cubic root of 66539344 is about 405.2218344730.

It can be divided in two parts, 665393 and 44, that multiplied together give a palindrome (29277292).

The spelling of 66539344 in words is "sixty-six million, five hundred thirty-nine thousand, three hundred forty-four".