553665762781 has 2 divisors, whose sum is σ = 553665762782. Its totient is φ = 553665762780.

The previous prime is 553665762779. The next prime is 553665762817. The reversal of 553665762781 is 187267566355.

Together with next prime (553665762817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499325956900 + 54339805881 = 706630^2 + 233109^2 .

It is a cyclic number.

It is not a de Polignac number, because 553665762781 - 2¹ = 553665762779 is a prime.

It is a super-2 number, since 2×553665762781² (a number of 24 digits) contains 22 as substring.

Together with 553665762779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (553665762731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276832881390 + 276832881391.

It is an arithmetic number, because the mean of its divisors is an integer number (276832881391).

Almost surely, 2^553665762781 is an apocalyptic number.

It is an amenable number.

553665762781 is a deficient number, since it is larger than the sum of its proper divisors (1).

553665762781 is an equidigital number, since it uses as much as digits as its factorization.

553665762781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504000, while the sum is 61.

The spelling of 553665762781 in words is "five hundred fifty-three billion, six hundred sixty-five million, seven hundred sixty-two thousand, seven hundred eighty-one".