555865456961 has 2 divisors, whose sum is σ = 555865456962. Its totient is φ = 555865456960.

The previous prime is 555865456943. The next prime is 555865456967. The reversal of 555865456961 is 169654568555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 309392925361 + 246472531600 = 556231^2 + 496460^2 .

It is a cyclic number.

It is not a de Polignac number, because 555865456961 - 2³⁴ = 538685587777 is a prime.

It is a super-2 number, since 2×555865456961² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (555865456967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277932728480 + 277932728481.

It is an arithmetic number, because the mean of its divisors is an integer number (277932728481).

Almost surely, 2^555865456961 is an apocalyptic number.

It is an amenable number.

555865456961 is a deficient number, since it is larger than the sum of its proper divisors (1).

555865456961 is an equidigital number, since it uses as much as digits as its factorization.

555865456961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400000, while the sum is 65.

The spelling of 555865456961 in words is "five hundred fifty-five billion, eight hundred sixty-five million, four hundred fifty-six thousand, nine hundred sixty-one".