718961948513 has 2 divisors, whose sum is σ = 718961948514. Its totient is φ = 718961948512.

The previous prime is 718961948503. The next prime is 718961948531. The reversal of 718961948513 is 315849169817.

Together with next prime (718961948531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 433605129169 + 285356819344 = 658487^2 + 534188^2 .

It is a cyclic number.

It is not a de Polignac number, because 718961948513 - 2¹⁰ = 718961947489 is a prime.

It is a super-2 number, since 2×718961948513² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (718961948503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359480974256 + 359480974257.

It is an arithmetic number, because the mean of its divisors is an integer number (359480974257).

Almost surely, 2^718961948513 is an apocalyptic number.

It is an amenable number.

718961948513 is a deficient number, since it is larger than the sum of its proper divisors (1).

718961948513 is an equidigital number, since it uses as much as digits as its factorization.

718961948513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 62.

The spelling of 718961948513 in words is "seven hundred eighteen billion, nine hundred sixty-one million, nine hundred forty-eight thousand, five hundred thirteen".