1390244518657 has 2 divisors, whose sum is σ = 1390244518658. Its totient is φ = 1390244518656.

The previous prime is 1390244518639. The next prime is 1390244518667. The reversal of 1390244518657 is 7568154420931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1356551713521 + 33692805136 = 1164711^2 + 183556^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390244518657 - 2³¹ = 1388097035009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1390244518598 and 1390244518607.

It is not a weakly prime, because it can be changed into another prime (1390244518667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695122259328 + 695122259329.

It is an arithmetic number, because the mean of its divisors is an integer number (695122259329).

It is a 1-persistent number, because it is pandigital, but 2⋅1390244518657 = 2780489037314 is not.

Almost surely, 2^{1390244518657} is an apocalyptic number.

It is an amenable number.

1390244518657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390244518657 is an equidigital number, since it uses as much as digits as its factorization.

1390244518657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7257600, while the sum is 55.

The spelling of 1390244518657 in words is "one trillion, three hundred ninety billion, two hundred forty-four million, five hundred eighteen thousand, six hundred fifty-seven".