318415077827521 has 2 divisors, whose sum is σ = 318415077827522. Its totient is φ = 318415077827520.

The previous prime is 318415077827417. The next prime is 318415077827653. The reversal of 318415077827521 is 125728770514813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318414081793921 + 996033600 = 17844161^2 + 31560^2 .

It is an emirp because it is prime and its reverse (125728770514813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318415077827521 - 2⁹ = 318415077827009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 318415077827521.

It is not a weakly prime, because it can be changed into another prime (318415077927521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159207538913760 + 159207538913761.

It is an arithmetic number, because the mean of its divisors is an integer number (159207538913761).

Almost surely, 2^{318415077827521} is an apocalyptic number.

It is an amenable number.

318415077827521 is a deficient number, since it is larger than the sum of its proper divisors (1).

318415077827521 is an equidigital number, since it uses as much as digits as its factorization.

318415077827521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26342400, while the sum is 61.

The spelling of 318415077827521 in words is "three hundred eighteen trillion, four hundred fifteen billion, seventy-seven million, eight hundred twenty-seven thousand, five hundred twenty-one".