5166856691 has 2 divisors, whose sum is σ = 5166856692. Its totient is φ = 5166856690.

The previous prime is 5166856679. The next prime is 5166856729. The reversal of 5166856691 is 1966586615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5166856691 - 2¹⁰ = 5166855667 is a prime.

It is not a weakly prime, because it can be changed into another prime (5166856391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2583428345 + 2583428346.

It is an arithmetic number, because the mean of its divisors is an integer number (2583428346).

Almost surely, 2^5166856691 is an apocalyptic number.

5166856691 is a deficient number, since it is larger than the sum of its proper divisors (1).

5166856691 is an equidigital number, since it uses as much as digits as its factorization.

5166856691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 53.

The square root of 5166856691 is about 71880.8506557901. The cubic root of 5166856691 is about 1728.7895896889.

The spelling of 5166856691 in words is "five billion, one hundred sixty-six million, eight hundred fifty-six thousand, six hundred ninety-one".