1667388543076 has 81 divisors (see below), whose sum is σ = 3075775675833. Its totient is φ = 790879499520.

The previous prime is 1667388543047. The next prime is 1667388543077. The reversal of 1667388543076 is 6703458837661.

The square root of 1667388543076 is 1291274.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 677411302500 + 989977240576 = 823050^2 + 994976^2 .

It is a super-2 number, since 2×1667388543076² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1667388542999 and 1667388543017.

It is not an unprimeable number, because it can be changed into a prime (1667388543077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4723480116 + ... + 4723480468.

Almost surely, 2^{1667388543076} is an apocalyptic number.

1667388543076 is the 1291274-th square number.

It is an amenable number.

1667388543076 is a deficient number, since it is larger than the sum of its proper divisors (1408387132757).

1667388543076 is an frugal number, since it uses more digits than its factorization.

1667388543076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 64.

Multiplying 1667388543076 by its sum of digits (64), we get a square (106712866756864 = 10330192²).

The spelling of 1667388543076 in words is "one trillion, six hundred sixty-seven billion, three hundred eighty-eight million, five hundred forty-three thousand, seventy-six".