57128449691 has 2 divisors, whose sum is σ = 57128449692. Its totient is φ = 57128449690.

The previous prime is 57128449667. The next prime is 57128449723. The reversal of 57128449691 is 19694482175.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 57128449691 - 2¹⁰ = 57128448667 is a prime.

It is not a weakly prime, because it can be changed into another prime (57128449601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28564224845 + 28564224846.

It is an arithmetic number, because the mean of its divisors is an integer number (28564224846).

Almost surely, 2^57128449691 is an apocalyptic number.

57128449691 is a deficient number, since it is larger than the sum of its proper divisors (1).

57128449691 is an equidigital number, since it uses as much as digits as its factorization.

57128449691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 56.

The spelling of 57128449691 in words is "fifty-seven billion, one hundred twenty-eight million, four hundred forty-nine thousand, six hundred ninety-one".