2163774156491 has 2 divisors, whose sum is σ = 2163774156492. Its totient is φ = 2163774156490.

The previous prime is 2163774156449. The next prime is 2163774156527. The reversal of 2163774156491 is 1946514773612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2163774156491 - 2¹⁰ = 2163774155467 is a prime.

It is not a weakly prime, because it can be changed into another prime (2163774156091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1081887078245 + 1081887078246.

It is an arithmetic number, because the mean of its divisors is an integer number (1081887078246).

Almost surely, 2^{2163774156491} is an apocalyptic number.

2163774156491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2163774156491 is an equidigital number, since it uses as much as digits as its factorization.

2163774156491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 56.

The spelling of 2163774156491 in words is "two trillion, one hundred sixty-three billion, seven hundred seventy-four million, one hundred fifty-six thousand, four hundred ninety-one".