1257712715545 has 32 divisors (see below), whose sum is σ = 1786053628800. Its totient is φ = 838175485440.

The previous prime is 1257712715537. The next prime is 1257712715549. The reversal of 1257712715545 is 5455172177521.

It is not a de Polignac number, because 1257712715545 - 2³ = 1257712715537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1257712715492 and 1257712715501.

It is not an unprimeable number, because it can be changed into a prime (1257712715549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6321895 + ... + 6517804.

It is an arithmetic number, because the mean of its divisors is an integer number (55814175900).

Almost surely, 2^{1257712715545} is an apocalyptic number.

It is an amenable number.

1257712715545 is a deficient number, since it is larger than the sum of its proper divisors (528340913255).

1257712715545 is a wasteful number, since it uses less digits than its factorization.

1257712715545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12839865.

The product of its digits is 3430000, while the sum is 52.

The spelling of 1257712715545 in words is "one trillion, two hundred fifty-seven billion, seven hundred twelve million, seven hundred fifteen thousand, five hundred forty-five".