1318881313257 has 8 divisors (see below), whose sum is σ = 1861950089376. Its totient is φ = 827533372992.

The previous prime is 1318881313249. The next prime is 1318881313261. The reversal of 1318881313257 is 7523131888131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1318881313257 - 2³ = 1318881313249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 25860417907 = 1318881313257 / (1 + 3 + 1 + 8 + 8 + 8 + 1 + 3 + 1 + 3 + 2 + 5 + 7).

It is not an unprimeable number, because it can be changed into a prime (1318881313237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12930208903 + ... + 12930209004.

It is an arithmetic number, because the mean of its divisors is an integer number (232743761172).

Almost surely, 2^{1318881313257} is an apocalyptic number.

1318881313257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1318881313257 is a deficient number, since it is larger than the sum of its proper divisors (543068776119).

1318881313257 is a wasteful number, since it uses less digits than its factorization.

1318881313257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25860417927.

The product of its digits is 967680, while the sum is 51.

The spelling of 1318881313257 in words is "one trillion, three hundred eighteen billion, eight hundred eighty-one million, three hundred thirteen thousand, two hundred fifty-seven".