1109852987657 has 2 divisors, whose sum is σ = 1109852987658. Its totient is φ = 1109852987656.

The previous prime is 1109852987651. The next prime is 1109852987687. The reversal of 1109852987657 is 7567892589011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 979745612041 + 130107375616 = 989821^2 + 360704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1109852987657 is a prime.

It is a super-2 number, since 2×1109852987657² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1109852987651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554926493828 + 554926493829.

It is an arithmetic number, because the mean of its divisors is an integer number (554926493829).

Almost surely, 2^{1109852987657} is an apocalyptic number.

It is an amenable number.

1109852987657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109852987657 is an equidigital number, since it uses as much as digits as its factorization.

1109852987657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76204800, while the sum is 68.

The spelling of 1109852987657 in words is "one trillion, one hundred nine billion, eight hundred fifty-two million, nine hundred eighty-seven thousand, six hundred fifty-seven".