555277772561 has 2 divisors, whose sum is σ = 555277772562. Its totient is φ = 555277772560.

The previous prime is 555277772507. The next prime is 555277772593. The reversal of 555277772561 is 165277772555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 425144424961 + 130133347600 = 652031^2 + 360740^2 .

It is a cyclic number.

It is not a de Polignac number, because 555277772561 - 2²² = 555273578257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 555277772561.

It is not a weakly prime, because it can be changed into another prime (555277772501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277638886280 + 277638886281.

It is an arithmetic number, because the mean of its divisors is an integer number (277638886281).

Almost surely, 2^555277772561 is an apocalyptic number.

It is an amenable number.

555277772561 is a deficient number, since it is larger than the sum of its proper divisors (1).

555277772561 is an equidigital number, since it uses as much as digits as its factorization.

555277772561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36015000, while the sum is 59.

The spelling of 555277772561 in words is "five hundred fifty-five billion, two hundred seventy-seven million, seven hundred seventy-two thousand, five hundred sixty-one".