555492961781 has 2 divisors, whose sum is σ = 555492961782. Its totient is φ = 555492961780.

The previous prime is 555492961763. The next prime is 555492961801. The reversal of 555492961781 is 187169294555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 496730353681 + 58762608100 = 704791^2 + 242410^2 .

It is a cyclic number.

It is not a de Polignac number, because 555492961781 - 2¹⁸ = 555492699637 is a prime.

It is a super-2 number, since 2×555492961781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (555492961481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277746480890 + 277746480891.

It is an arithmetic number, because the mean of its divisors is an integer number (277746480891).

Almost surely, 2^555492961781 is an apocalyptic number.

It is an amenable number.

555492961781 is a deficient number, since it is larger than the sum of its proper divisors (1).

555492961781 is an equidigital number, since it uses as much as digits as its factorization.

555492961781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216000, while the sum is 62.

The spelling of 555492961781 in words is "five hundred fifty-five billion, four hundred ninety-two million, nine hundred sixty-one thousand, seven hundred eighty-one".