1257134742717 has 16 divisors (see below), whose sum is σ = 1923649105920. Its totient is φ = 715357005552.

The previous prime is 1257134742709. The next prime is 1257134742733. The reversal of 1257134742717 is 7172474317521.

It is not a de Polignac number, because 1257134742717 - 2³ = 1257134742709 is a prime.

It is a super-2 number, since 2×1257134742717² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1257134742717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257134742707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125232553 + ... + 125242590.

It is an arithmetic number, because the mean of its divisors is an integer number (120228069120).

Almost surely, 2^{1257134742717} is an apocalyptic number.

It is an amenable number.

1257134742717 is a deficient number, since it is larger than the sum of its proper divisors (666514363203).

1257134742717 is a wasteful number, since it uses less digits than its factorization.

1257134742717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250475392.

The product of its digits is 2304960, while the sum is 51.

The spelling of 1257134742717 in words is "one trillion, two hundred fifty-seven billion, one hundred thirty-four million, seven hundred forty-two thousand, seven hundred seventeen".