1257270726349 has 4 divisors (see below), whose sum is σ = 1371568065120. Its totient is φ = 1142973387580.

The previous prime is 1257270726323. The next prime is 1257270726353. The reversal of 1257270726349 is 9436270727521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1257270726349 - 2²⁹ = 1256733855437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1257270726349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257270726149) 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, 57148669369 + ... + 57148669390.

It is an arithmetic number, because the mean of its divisors is an integer number (342892016280).

Almost surely, 2^{1257270726349} is an apocalyptic number.

It is an amenable number.

1257270726349 is a deficient number, since it is larger than the sum of its proper divisors (114297338771).

1257270726349 is a wasteful number, since it uses less digits than its factorization.

1257270726349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114297338770.

The product of its (nonzero) digits is 8890560, while the sum is 55.

The spelling of 1257270726349 in words is "one trillion, two hundred fifty-seven billion, two hundred seventy million, seven hundred twenty-six thousand, three hundred forty-nine".