5166551561 has 2 divisors, whose sum is σ = 5166551562. Its totient is φ = 5166551560.

The previous prime is 5166551531. The next prime is 5166551581. The reversal of 5166551561 is 1651556615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3836563600 + 1329987961 = 61940^2 + 36469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5166551561 is a prime.

It is not a weakly prime, because it can be changed into another prime (5166551531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2583275780 + 2583275781.

It is an arithmetic number, because the mean of its divisors is an integer number (2583275781).

Almost surely, 2^5166551561 is an apocalyptic number.

It is an amenable number.

5166551561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5166551561 is an equidigital number, since it uses as much as digits as its factorization.

5166551561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 135000, while the sum is 41.

The square root of 5166551561 is about 71878.7281537452. The cubic root of 5166551561 is about 1728.7555576534.

The spelling of 5166551561 in words is "five billion, one hundred sixty-six million, five hundred fifty-one thousand, five hundred sixty-one".