551566166 has 4 divisors (see below), whose sum is σ = 827349252. Its totient is φ = 275783082.

The previous prime is 551566121. The next prime is 551566201. The reversal of 551566166 is 661665155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 661665155 = 5 ⋅132333031.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137891540 + ... + 137891543.

It is an arithmetic number, because the mean of its divisors is an integer number (206837313).

Almost surely, 2^551566166 is an apocalyptic number.

551566166 is a deficient number, since it is larger than the sum of its proper divisors (275783086).

551566166 is a wasteful number, since it uses less digits than its factorization.

551566166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275783085.

The product of its digits is 162000, while the sum is 41.

The square root of 551566166 is about 23485.4458335370. The cubic root of 551566166 is about 820.0982263851.

The spelling of 551566166 in words is "five hundred fifty-one million, five hundred sixty-six thousand, one hundred sixty-six".