66733556 has 6 divisors (see below), whose sum is σ = 116783730. Its totient is φ = 33366776.

The previous prime is 66733531. The next prime is 66733631. The reversal of 66733556 is 65533766.

It can be written as a sum of positive squares in only one way, i.e., 38812900 + 27920656 = 6230^2 + 5284^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8341691 + ... + 8341698.

It is an arithmetic number, because the mean of its divisors is an integer number (19463955).

Almost surely, 2^66733556 is an apocalyptic number.

It is an amenable number.

66733556 is a deficient number, since it is larger than the sum of its proper divisors (50050174).

66733556 is a wasteful number, since it uses less digits than its factorization.

66733556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16683393 (or 16683391 counting only the distinct ones).

The product of its digits is 340200, while the sum is 41.

The square root of 66733556 is about 8169.0609007401. The cubic root of 66733556 is about 405.6156991876.

The spelling of 66733556 in words is "sixty-six million, seven hundred thirty-three thousand, five hundred fifty-six".