1138618705649 has 2 divisors, whose sum is σ = 1138618705650. Its totient is φ = 1138618705648.

The previous prime is 1138618705607. The next prime is 1138618705673. The reversal of 1138618705649 is 9465078168311.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1089570630625 + 49048075024 = 1043825^2 + 221468^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1138618705649 is a prime.

It is a super-2 number, since 2×1138618705649² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1138618765649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569309352824 + 569309352825.

It is an arithmetic number, because the mean of its divisors is an integer number (569309352825).

Almost surely, 2^{1138618705649} is an apocalyptic number.

It is an amenable number.

1138618705649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138618705649 is an equidigital number, since it uses as much as digits as its factorization.

1138618705649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8709120, while the sum is 59.

The spelling of 1138618705649 in words is "one trillion, one hundred thirty-eight billion, six hundred eighteen million, seven hundred five thousand, six hundred forty-nine".