5166156581 has 2 divisors, whose sum is σ = 5166156582. Its totient is φ = 5166156580.

The previous prime is 5166156577. The next prime is 5166156613. The reversal of 5166156581 is 1856516615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3386076100 + 1780080481 = 58190^2 + 42191^2 .

It is a cyclic number.

It is not a de Polignac number, because 5166156581 - 2² = 5166156577 is a prime.

It is a super-2 number, since 2×5166156581² = 53378347638819219122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5166156511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2583078290 + 2583078291.

It is an arithmetic number, because the mean of its divisors is an integer number (2583078291).

Almost surely, 2^5166156581 is an apocalyptic number.

It is an amenable number.

5166156581 is a deficient number, since it is larger than the sum of its proper divisors (1).

5166156581 is an equidigital number, since it uses as much as digits as its factorization.

5166156581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216000, while the sum is 44.

The square root of 5166156581 is about 71875.9805567896. The cubic root of 5166156581 is about 1728.7115023963.

The spelling of 5166156581 in words is "five billion, one hundred sixty-six million, one hundred fifty-six thousand, five hundred eighty-one".