8557156457 has 2 divisors, whose sum is σ = 8557156458. Its totient is φ = 8557156456.

The previous prime is 8557156441. The next prime is 8557156471. The reversal of 8557156457 is 7546517558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8408706601 + 148449856 = 91699^2 + 12184^2 .

It is a cyclic number.

It is not a de Polignac number, because 8557156457 - 2⁴ = 8557156441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8557156399 and 8557156408.

It is not a weakly prime, because it can be changed into another prime (8557156757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4278578228 + 4278578229.

It is an arithmetic number, because the mean of its divisors is an integer number (4278578229).

Almost surely, 2^8557156457 is an apocalyptic number.

It is an amenable number.

8557156457 is a deficient number, since it is larger than the sum of its proper divisors (1).

8557156457 is an equidigital number, since it uses as much as digits as its factorization.

8557156457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880000, while the sum is 53.

The square root of 8557156457 is about 92504.8996378030. The cubic root of 8557156457 is about 2045.3917074159.

The spelling of 8557156457 in words is "eight billion, five hundred fifty-seven million, one hundred fifty-six thousand, four hundred fifty-seven".