1219840966161 has 16 divisors (see below), whose sum is σ = 1807346704000. Its totient is φ = 813148604784.

The previous prime is 1219840966159. The next prime is 1219840966163. The reversal of 1219840966161 is 1616690489121.

1219840966161 is a `hidden beast` number, since 1 + 2 + 19 + 8 + 4 + 0 + 9 + 6 + 616 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1219840966159) and next prime (1219840966163).

It is not a de Polignac number, because 1219840966161 - 2¹ = 1219840966159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1219840966098 and 1219840966107.

It is not an unprimeable number, because it can be changed into a prime (1219840966163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1901461 + ... + 2460738.

It is an arithmetic number, because the mean of its divisors is an integer number (112959169000).

Almost surely, 2^{1219840966161} is an apocalyptic number.

It is an amenable number.

1219840966161 is a deficient number, since it is larger than the sum of its proper divisors (587505737839).

1219840966161 is a wasteful number, since it uses less digits than its factorization.

1219840966161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4372565 (or 4372559 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 1219840966161 in words is "one trillion, two hundred nineteen billion, eight hundred forty million, nine hundred sixty-six thousand, one hundred sixty-one".