1257134742709 has 2 divisors, whose sum is σ = 1257134742710. Its totient is φ = 1257134742708.

The previous prime is 1257134742707. The next prime is 1257134742733. The reversal of 1257134742709 is 9072474317521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 929338416484 + 327796326225 = 964022^2 + 572535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1257134742709 - 2¹ = 1257134742707 is a prime.

It is a super-2 number, since 2×1257134742709² (a number of 25 digits) contains 22 as substring.

Together with 1257134742707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257134742707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628567371354 + 628567371355.

It is an arithmetic number, because the mean of its divisors is an integer number (628567371355).

Almost surely, 2^{1257134742709} is an apocalyptic number.

It is an amenable number.

1257134742709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257134742709 is an equidigital number, since it uses as much as digits as its factorization.

1257134742709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2963520, while the sum is 52.

The spelling of 1257134742709 in words is "one trillion, two hundred fifty-seven billion, one hundred thirty-four million, seven hundred forty-two thousand, seven hundred nine".