1186137583781 has 2 divisors, whose sum is σ = 1186137583782. Its totient is φ = 1186137583780.

The previous prime is 1186137583733. The next prime is 1186137583847. The reversal of 1186137583781 is 1873857316811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 844485643681 + 341651940100 = 918959^2 + 584510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1186137583781 - 2⁶ = 1186137583717 is a prime.

It is a super-2 number, since 2×1186137583781² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1186137583781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1186137583181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593068791890 + 593068791891.

It is an arithmetic number, because the mean of its divisors is an integer number (593068791891).

Almost surely, 2^{1186137583781} is an apocalyptic number.

It is an amenable number.

1186137583781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1186137583781 is an equidigital number, since it uses as much as digits as its factorization.

1186137583781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6773760, while the sum is 59.

The spelling of 1186137583781 in words is "one trillion, one hundred eighty-six billion, one hundred thirty-seven million, five hundred eighty-three thousand, seven hundred eighty-one".