1257257397812 has 48 divisors (see below), whose sum is σ = 2446364723712. Its totient is φ = 561442976640.

The previous prime is 1257257397811. The next prime is 1257257397853. The reversal of 1257257397812 is 2187937527521.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257257397811) 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 in 15 ways as a sum of consecutive naturals, for example, 8351318 + ... + 8500530.

It is an arithmetic number, because the mean of its divisors is an integer number (50965931744).

Almost surely, 2^{1257257397812} is an apocalyptic number.

It is an amenable number.

1257257397812 is a deficient number, since it is larger than the sum of its proper divisors (1189107325900).

1257257397812 is a wasteful number, since it uses less digits than its factorization.

1257257397812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154488 (or 154486 counting only the distinct ones).

The product of its digits is 14817600, while the sum is 59.

The spelling of 1257257397812 in words is "one trillion, two hundred fifty-seven billion, two hundred fifty-seven million, three hundred ninety-seven thousand, eight hundred twelve".