1257812168 has 12 divisors (see below), whose sum is σ = 2358585915. Its totient is φ = 628855928.

The previous prime is 1257812161. The next prime is 1257812173. The reversal of 1257812168 is 8612187521.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 628906084 + 628906084 = 25078^2 + 25078^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=25078.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1257812161) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 94043 + ... + 106581.

Almost surely, 2^1257812168 is an apocalyptic number.

It is an amenable number.

1257812168 is a deficient number, since it is larger than the sum of its proper divisors (1100773747).

1257812168 is an frugal number, since it uses more digits than its factorization.

1257812168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25084 (or 12541 counting only the distinct ones).

The product of its digits is 53760, while the sum is 41.

The square root of 1257812168 is about 35465.6477171925. The cubic root of 1257812168 is about 1079.4567935880.

Adding to 1257812168 its reverse (8612187521), we get a palindrome (9869999689).

The spelling of 1257812168 in words is "one billion, two hundred fifty-seven million, eight hundred twelve thousand, one hundred sixty-eight".