553220666 has 4 divisors (see below), whose sum is σ = 829831002. Its totient is φ = 276610332.

The previous prime is 553220653. The next prime is 553220669. The reversal of 553220666 is 666022355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666022355 = 5 ⋅133204471.

It can be written as a sum of positive squares in only one way, i.e., 328370641 + 224850025 = 18121^2 + 14995^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (553220669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138305165 + ... + 138305168.

Almost surely, 2^553220666 is an apocalyptic number.

553220666 is a deficient number, since it is larger than the sum of its proper divisors (276610336).

553220666 is a wasteful number, since it uses less digits than its factorization.

553220666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276610335.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 553220666 is about 23520.6434010637. The cubic root of 553220666 is about 820.9174076944.

The spelling of 553220666 in words is "five hundred fifty-three million, two hundred twenty thousand, six hundred sixty-six".