1017709255649 has 4 divisors (see below), whose sum is σ = 1018005708036. Its totient is φ = 1017412803264.

The previous prime is 1017709255643. The next prime is 1017709255657. The reversal of 1017709255649 is 9465529077101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 652371213025 + 365338042624 = 807695^2 + 604432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1017709255649 is a prime.

It is a super-2 number, since 2×1017709255649² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1017709255594 and 1017709255603.

It is not an unprimeable number, because it can be changed into a prime (1017709255643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148221044 + ... + 148227909.

It is an arithmetic number, because the mean of its divisors is an integer number (254501427009).

Almost surely, 2^{1017709255649} is an apocalyptic number.

It is an amenable number.

1017709255649 is a deficient number, since it is larger than the sum of its proper divisors (296452387).

1017709255649 is an equidigital number, since it uses as much as digits as its factorization.

1017709255649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296452386.

The product of its (nonzero) digits is 4762800, while the sum is 56.

The spelling of 1017709255649 in words is "one trillion, seventeen billion, seven hundred nine million, two hundred fifty-five thousand, six hundred forty-nine".