1257139316867 has 4 divisors (see below), whose sum is σ = 1436730647856. Its totient is φ = 1077547985880.

The previous prime is 1257139316863. The next prime is 1257139316941. The reversal of 1257139316867 is 7686139317521.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1257139316867 - 2² = 1257139316863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1257139316861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89795665484 + ... + 89795665497.

It is an arithmetic number, because the mean of its divisors is an integer number (359182661964).

Almost surely, 2^{1257139316867} is an apocalyptic number.

1257139316867 is a deficient number, since it is larger than the sum of its proper divisors (179591330989).

1257139316867 is an equidigital number, since it uses as much as digits as its factorization.

1257139316867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179591330988.

The product of its digits is 11430720, while the sum is 59.

The spelling of 1257139316867 in words is "one trillion, two hundred fifty-seven billion, one hundred thirty-nine million, three hundred sixteen thousand, eight hundred sixty-seven".