1187164339561 has 2 divisors, whose sum is σ = 1187164339562. Its totient is φ = 1187164339560.

The previous prime is 1187164339553. The next prime is 1187164339579. The reversal of 1187164339561 is 1659334617811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 794700931600 + 392463407961 = 891460^2 + 626469^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187164339561 - 2³ = 1187164339553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1187164339591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593582169780 + 593582169781.

It is an arithmetic number, because the mean of its divisors is an integer number (593582169781).

Almost surely, 2^{1187164339561} is an apocalyptic number.

It is an amenable number.

1187164339561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187164339561 is an equidigital number, since it uses as much as digits as its factorization.

1187164339561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 55.

The spelling of 1187164339561 in words is "one trillion, one hundred eighty-seven billion, one hundred sixty-four million, three hundred thirty-nine thousand, five hundred sixty-one".