1671211221668 has 12 divisors (see below), whose sum is σ = 2924690237532. Its totient is φ = 835585439520.

The previous prime is 1671211221661. The next prime is 1671211221671. The reversal of 1671211221668 is 8661221121761.

It can be written as a sum of positive squares in 2 ways, for example, as 534241122724 + 1136970098944 = 730918^2 + 1066288^2 .

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1671211221661) 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 3 ways as a sum of consecutive naturals, for example, 4855643 + ... + 5188418.

It is an arithmetic number, because the mean of its divisors is an integer number (243724186461).

Almost surely, 2^{1671211221668} is an apocalyptic number.

It is an amenable number.

1671211221668 is a deficient number, since it is larger than the sum of its proper divisors (1253479015864).

1671211221668 is a wasteful number, since it uses less digits than its factorization.

1671211221668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10085662 (or 10085660 counting only the distinct ones).

The product of its digits is 96768, while the sum is 44.

The spelling of 1671211221668 in words is "one trillion, six hundred seventy-one billion, two hundred eleven million, two hundred twenty-one thousand, six hundred sixty-eight".