551666893 has 2 divisors, whose sum is σ = 551666894. Its totient is φ = 551666892.

The previous prime is 551666851. The next prime is 551666903. The reversal of 551666893 is 398666155.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 474455524 + 77211369 = 21782^2 + 8787^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551666893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551661893) by changing a digit.

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, 275833446 + 275833447.

It is an arithmetic number, because the mean of its divisors is an integer number (275833447).

Almost surely, 2^551666893 is an apocalyptic number.

It is an amenable number.

551666893 is a deficient number, since it is larger than the sum of its proper divisors (1).

551666893 is an equidigital number, since it uses as much as digits as its factorization.

551666893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1166400, while the sum is 49.

The square root of 551666893 is about 23487.5901914181. The cubic root of 551666893 is about 820.1481454526.

The spelling of 551666893 in words is "five hundred fifty-one million, six hundred sixty-six thousand, eight hundred ninety-three".