1667794368644 has 12 divisors (see below), whose sum is σ = 2918692016268. Its totient is φ = 833882364000.

The previous prime is 1667794368613. The next prime is 1667794368689. The reversal of 1667794368644 is 4468634977661.

It can be written as a sum of positive squares in 2 ways, for example, as 557590758400 + 1110203610244 = 746720^2 + 1053662^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3449927 + ... + 3903534.

It is an arithmetic number, because the mean of its divisors is an integer number (243224334689).

Almost surely, 2^{1667794368644} is an apocalyptic number.

It is an amenable number.

1667794368644 is a deficient number, since it is larger than the sum of its proper divisors (1250897647624).

1667794368644 is a wasteful number, since it uses less digits than its factorization.

1667794368644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7410166 (or 7410164 counting only the distinct ones).

The product of its digits is 877879296, while the sum is 71.

The spelling of 1667794368644 in words is "one trillion, six hundred sixty-seven billion, seven hundred ninety-four million, three hundred sixty-eight thousand, six hundred forty-four".