123257585809 has 2 divisors, whose sum is σ = 123257585810. Its totient is φ = 123257585808.

The previous prime is 123257585777. The next prime is 123257585827. The reversal of 123257585809 is 908585752321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122449605184 + 807980625 = 349928^2 + 28425^2 .

It is a cyclic number.

It is not a de Polignac number, because 123257585809 - 2⁵ = 123257585777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123257585809.

It is not a weakly prime, because it can be changed into another prime (123257585839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61628792904 + 61628792905.

It is an arithmetic number, because the mean of its divisors is an integer number (61628792905).

Almost surely, 2^123257585809 is an apocalyptic number.

It is an amenable number.

123257585809 is a deficient number, since it is larger than the sum of its proper divisors (1).

123257585809 is an equidigital number, since it uses as much as digits as its factorization.

123257585809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048000, while the sum is 55.

The spelling of 123257585809 in words is "one hundred twenty-three billion, two hundred fifty-seven million, five hundred eighty-five thousand, eight hundred nine".