551806663 has 2 divisors, whose sum is σ = 551806664. Its totient is φ = 551806662.

The previous prime is 551806657. The next prime is 551806679. The reversal of 551806663 is 366608155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 551806663 - 2⁵ = 551806631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551806613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275903331 + 275903332.

It is an arithmetic number, because the mean of its divisors is an integer number (275903332).

Almost surely, 2^551806663 is an apocalyptic number.

551806663 is a deficient number, since it is larger than the sum of its proper divisors (1).

551806663 is an equidigital number, since it uses as much as digits as its factorization.

551806663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 551806663 is about 23490.5654040085. The cubic root of 551806663 is about 820.2174036880.

The spelling of 551806663 in words is "five hundred fifty-one million, eight hundred six thousand, six hundred sixty-three".