7426557857 has 2 divisors, whose sum is σ = 7426557858. Its totient is φ = 7426557856.

The previous prime is 7426557851. The next prime is 7426557893. The reversal of 7426557857 is 7587556247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3789141136 + 3637416721 = 61556^2 + 60311^2 .

It is a cyclic number.

It is not a de Polignac number, because 7426557857 - 2⁴ = 7426557841 is a prime.

It is not a weakly prime, because it can be changed into another prime (7426557851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3713278928 + 3713278929.

It is an arithmetic number, because the mean of its divisors is an integer number (3713278929).

Almost surely, 2^7426557857 is an apocalyptic number.

It is an amenable number.

7426557857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7426557857 is an equidigital number, since it uses as much as digits as its factorization.

7426557857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16464000, while the sum is 56.

The square root of 7426557857 is about 86177.4788271275. The cubic root of 7426557857 is about 1951.0236008362.

The spelling of 7426557857 in words is "seven billion, four hundred twenty-six million, five hundred fifty-seven thousand, eight hundred fifty-seven".