318723881457 has 4 divisors (see below), whose sum is σ = 424965175280. Its totient is φ = 212482587636.

The previous prime is 318723881453. The next prime is 318723881471. The reversal of 318723881457 is 754188327813.

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, and also an emirpimes, since its reverse is a distinct semiprime: 754188327813 = 3 ⋅251396109271.

It is not a de Polignac number, because 318723881457 - 2² = 318723881453 is a prime.

It is a super-2 number, since 2×318723881457² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 318723881397 and 318723881406.

It is not an unprimeable number, because it can be changed into a prime (318723881453) 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, 53120646907 + ... + 53120646912.

It is an arithmetic number, because the mean of its divisors is an integer number (106241293820).

Almost surely, 2^318723881457 is an apocalyptic number.

It is an amenable number.

318723881457 is a deficient number, since it is larger than the sum of its proper divisors (106241293823).

318723881457 is a wasteful number, since it uses less digits than its factorization.

318723881457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106241293822.

The product of its digits is 9031680, while the sum is 57.

The spelling of 318723881457 in words is "three hundred eighteen billion, seven hundred twenty-three million, eight hundred eighty-one thousand, four hundred fifty-seven".