553066781 has 2 divisors, whose sum is σ = 553066782. Its totient is φ = 553066780.

The previous prime is 553066769. The next prime is 553066799. The reversal of 553066781 is 187660355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 552955225 + 111556 = 23515^2 + 334^2 .

It is a cyclic number.

It is not a de Polignac number, because 553066781 - 2²⁶ = 485957917 is a prime.

It is a super-2 number, since 2×553066781² = 611765728491403922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (553066751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276533390 + 276533391.

It is an arithmetic number, because the mean of its divisors is an integer number (276533391).

Almost surely, 2^553066781 is an apocalyptic number.

It is an amenable number.

553066781 is a deficient number, since it is larger than the sum of its proper divisors (1).

553066781 is an equidigital number, since it uses as much as digits as its factorization.

553066781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 553066781 is about 23517.3718982373. The cubic root of 553066781 is about 820.8412846101.

The spelling of 553066781 in words is "five hundred fifty-three million, sixty-six thousand, seven hundred eighty-one".