551020666 has 8 divisors (see below), whose sum is σ = 944606880. Its totient is φ = 236151708.

The previous prime is 551020633. The next prime is 551020669. The reversal of 551020666 is 666020155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (551020669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19679296 + ... + 19679323.

It is an arithmetic number, because the mean of its divisors is an integer number (118075860).

Almost surely, 2^551020666 is an apocalyptic number.

551020666 is a deficient number, since it is larger than the sum of its proper divisors (393586214).

551020666 is a wasteful number, since it uses less digits than its factorization.

551020666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39358628.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 551020666 is about 23473.8293850833. The cubic root of 551020666 is about 819.8277776324.

The spelling of 551020666 in words is "five hundred fifty-one million, twenty thousand, six hundred sixty-six".