1257860650349 has 4 divisors (see below), whose sum is σ = 1275091618236. Its totient is φ = 1240629682464.

The previous prime is 1257860650289. The next prime is 1257860650363. The reversal of 1257860650349 is 9430560687521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 432034087849 + 825826562500 = 657293^2 + 908750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1257860650349 - 2¹² = 1257860646253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1257860650294 and 1257860650303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257860650369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8615483834 + ... + 8615483979.

It is an arithmetic number, because the mean of its divisors is an integer number (318772904559).

It is a 1-persistent number, because it is pandigital, but 2⋅1257860650349 = 2515721300698 is not.

Almost surely, 2^{1257860650349} is an apocalyptic number.

It is an amenable number.

1257860650349 is a deficient number, since it is larger than the sum of its proper divisors (17230967887).

1257860650349 is an equidigital number, since it uses as much as digits as its factorization.

1257860650349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17230967886.

The product of its (nonzero) digits is 10886400, while the sum is 56.

The spelling of 1257860650349 in words is "one trillion, two hundred fifty-seven billion, eight hundred sixty million, six hundred fifty thousand, three hundred forty-nine".