1318413625621 has 2 divisors, whose sum is σ = 1318413625622. Its totient is φ = 1318413625620.

The previous prime is 1318413625603. The next prime is 1318413625631. The reversal of 1318413625621 is 1265263148131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 711299944996 + 607113680625 = 843386^2 + 779175^2 .

It is a cyclic number.

It is not a de Polignac number, because 1318413625621 - 2¹⁹ = 1318413101333 is a prime.

It is a super-2 number, since 2×1318413625621² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1318413625631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659206812810 + 659206812811.

It is an arithmetic number, because the mean of its divisors is an integer number (659206812811).

Almost surely, 2^{1318413625621} is an apocalyptic number.

It is an amenable number.

1318413625621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318413625621 is an equidigital number, since it uses as much as digits as its factorization.

1318413625621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 43.

The spelling of 1318413625621 in words is "one trillion, three hundred eighteen billion, four hundred thirteen million, six hundred twenty-five thousand, six hundred twenty-one".