131778772672493 has 2 divisors, whose sum is σ = 131778772672494. Its totient is φ = 131778772672492.

The previous prime is 131778772672487. The next prime is 131778772672583. The reversal of 131778772672493 is 394276277877131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79180045432489 + 52598727240004 = 8898317^2 + 7252498^2 .

It is a cyclic number.

It is not a de Polignac number, because 131778772672493 - 2¹⁴ = 131778772656109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 131778772672493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131778772678493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65889386336246 + 65889386336247.

It is an arithmetic number, because the mean of its divisors is an integer number (65889386336247).

Almost surely, 2^{131778772672493} is an apocalyptic number.

It is an amenable number.

131778772672493 is a deficient number, since it is larger than the sum of its proper divisors (1).

131778772672493 is an equidigital number, since it uses as much as digits as its factorization.

131778772672493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1045529856, while the sum is 74.

The spelling of 131778772672493 in words is "one hundred thirty-one trillion, seven hundred seventy-eight billion, seven hundred seventy-two million, six hundred seventy-two thousand, four hundred ninety-three".