318751762561 has 2 divisors, whose sum is σ = 318751762562. Its totient is φ = 318751762560.

The previous prime is 318751762559. The next prime is 318751762579. The reversal of 318751762561 is 165267157813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172889640000 + 145862122561 = 415800^2 + 381919^2 .

It is a cyclic number.

It is not a de Polignac number, because 318751762561 - 2¹ = 318751762559 is a prime.

It is a super-2 number, since 2×318751762561² (a number of 24 digits) contains 22 as substring.

Together with 318751762559, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 318751762499 and 318751762508.

It is not a weakly prime, because it can be changed into another prime (318751762261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159375881280 + 159375881281.

It is an arithmetic number, because the mean of its divisors is an integer number (159375881281).

Almost surely, 2^318751762561 is an apocalyptic number.

It is an amenable number.

318751762561 is a deficient number, since it is larger than the sum of its proper divisors (1).

318751762561 is an equidigital number, since it uses as much as digits as its factorization.

318751762561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2116800, while the sum is 52.

The spelling of 318751762561 in words is "three hundred eighteen billion, seven hundred fifty-one million, seven hundred sixty-two thousand, five hundred sixty-one".