8551187761 has 2 divisors, whose sum is σ = 8551187762. Its totient is φ = 8551187760.

The previous prime is 8551187719. The next prime is 8551187783. The reversal of 8551187761 is 1677811558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5272938225 + 3278249536 = 72615^2 + 57256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8551187761 is a prime.

It is not a weakly prime, because it can be changed into another prime (8551167761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4275593880 + 4275593881.

It is an arithmetic number, because the mean of its divisors is an integer number (4275593881).

Almost surely, 2^8551187761 is an apocalyptic number.

It is an amenable number.

8551187761 is a deficient number, since it is larger than the sum of its proper divisors (1).

8551187761 is an equidigital number, since it uses as much as digits as its factorization.

8551187761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 470400, while the sum is 49.

The square root of 8551187761 is about 92472.6324974043. The cubic root of 8551187761 is about 2044.9160369080.

The spelling of 8551187761 in words is "eight billion, five hundred fifty-one million, one hundred eighty-seven thousand, seven hundred sixty-one".