66739556 has 24 divisors (see below), whose sum is σ = 130118520. Its totient is φ = 29740032.

The previous prime is 66739529. The next prime is 66739567. The reversal of 66739556 is 65593766.

It can be written as a sum of positive squares in 4 ways, for example, as 14668900 + 52070656 = 3830^2 + 7216^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66739556.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20621 + ... + 23636.

It is an arithmetic number, because the mean of its divisors is an integer number (5421605).

Almost surely, 2^66739556 is an apocalyptic number.

It is an amenable number.

66739556 is a deficient number, since it is larger than the sum of its proper divisors (63378964).

66739556 is a wasteful number, since it uses less digits than its factorization.

66739556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44303 (or 44301 counting only the distinct ones).

The product of its digits is 1020600, while the sum is 47.

The square root of 66739556 is about 8169.4281317605. The cubic root of 66739556 is about 405.6278550974.

The spelling of 66739556 in words is "sixty-six million, seven hundred thirty-nine thousand, five hundred fifty-six".