1666053633049 has 9 divisors (see below), whose sum is σ = 1804088080413. Its totient is φ = 1537880172192.

The previous prime is 1666053633031. The next prime is 1666053633059. The reversal of 1666053633049 is 9403363506661.

The square root of 1666053633049 is 1290757.

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

It can be written as a sum of positive squares in 4 ways, for example, as 189507855625 + 1476545777424 = 435325^2 + 1215132^2 .

It is not a de Polignac number, because 1666053633049 - 2¹³ = 1666053624857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1666053632987 and 1666053633005.

It is not an unprimeable number, because it can be changed into a prime (1666053633059) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16730197 + ... + 16829485.

It is an arithmetic number, because the mean of its divisors is an integer number (200454231157).

Almost surely, 2^{1666053633049} is an apocalyptic number.

1666053633049 is the 1290757-th square number.

1666053633049 is the 645379-th centered octagonal number.

It is an amenable number.

1666053633049 is a deficient number, since it is larger than the sum of its proper divisors (138034447364).

1666053633049 is an frugal number, since it uses more digits than its factorization.

1666053633049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198604 (or 99302 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 52.

The spelling of 1666053633049 in words is "one trillion, six hundred sixty-six billion, fifty-three million, six hundred thirty-three thousand, forty-nine".