1178395061689 has 2 divisors, whose sum is σ = 1178395061690. Its totient is φ = 1178395061688.

The previous prime is 1178395061687. The next prime is 1178395061743. The reversal of 1178395061689 is 9861605938711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 599707750464 + 578687311225 = 774408^2 + 760715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1178395061689 - 2¹ = 1178395061687 is a prime.

It is a super-2 number, since 2×1178395061689² (a number of 25 digits) contains 22 as substring.

Together with 1178395061687, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1178395061689.

It is not a weakly prime, because it can be changed into another prime (1178395061687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 589197530844 + 589197530845.

It is an arithmetic number, because the mean of its divisors is an integer number (589197530845).

Almost surely, 2^{1178395061689} is an apocalyptic number.

It is an amenable number.

1178395061689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1178395061689 is an equidigital number, since it uses as much as digits as its factorization.

1178395061689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19595520, while the sum is 64.

The spelling of 1178395061689 in words is "one trillion, one hundred seventy-eight billion, three hundred ninety-five million, sixty-one thousand, six hundred eighty-nine".