551166665666 has 8 divisors (see below), whose sum is σ = 826818119424. Its totient is φ = 275560625860.

The previous prime is 551166665627. The next prime is 551166665669. The reversal of 551166665666 is 666566661155.

It is a happy number.

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 (551166665669) 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, 11323130 + ... + 11371701.

It is an arithmetic number, because the mean of its divisors is an integer number (103352264928).

Almost surely, 2^551166665666 is an apocalyptic number.

551166665666 is a deficient number, since it is larger than the sum of its proper divisors (275651453758).

551166665666 is a wasteful number, since it uses less digits than its factorization.

551166665666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22706976.

The product of its digits is 34992000, while the sum is 59.

The spelling of 551166665666 in words is "five hundred fifty-one billion, one hundred sixty-six million, six hundred sixty-five thousand, six hundred sixty-six".