1671663213373 has 4 divisors (see below), whose sum is σ = 1674444683548. Its totient is φ = 1668881743200.

The previous prime is 1671663213359. The next prime is 1671663213401. The reversal of 1671663213373 is 3733123661761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1213121610724 + 458541602649 = 1101418^2 + 677157^2 .

It is a cyclic number.

It is not a de Polignac number, because 1671663213373 - 2¹⁷ = 1671663082301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671663213323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1390734186 + ... + 1390735387.

It is an arithmetic number, because the mean of its divisors is an integer number (418611170887).

Almost surely, 2^{1671663213373} is an apocalyptic number.

It is an amenable number.

1671663213373 is a deficient number, since it is larger than the sum of its proper divisors (2781470175).

1671663213373 is an equidigital number, since it uses as much as digits as its factorization.

1671663213373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2781470174.

The product of its digits is 1714608, while the sum is 49.

The spelling of 1671663213373 in words is "one trillion, six hundred seventy-one billion, six hundred sixty-three million, two hundred thirteen thousand, three hundred seventy-three".