1671489565321 has 9 divisors (see below), whose sum is σ = 1674807148749. Its totient is φ = 1668178548300.

The previous prime is 1671489565301. The next prime is 1671489565423. The reversal of 1671489565321 is 1235659841761.

The square root of 1671489565321 is 1292861.

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

It is not a de Polignac number, because 1671489565321 - 2⁵ = 1671489565289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1671489565301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 893366016 + ... + 893367886.

Almost surely, 2^{1671489565321} is an apocalyptic number.

1671489565321 is the 1292861-st square number.

1671489565321 is the 646431-st centered octagonal number.

It is an amenable number.

1671489565321 is a deficient number, since it is larger than the sum of its proper divisors (3317583428).

1671489565321 is an frugal number, since it uses more digits than its factorization.

1671489565321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5124 (or 2562 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 58.

The spelling of 1671489565321 in words is "one trillion, six hundred seventy-one billion, four hundred eighty-nine million, five hundred sixty-five thousand, three hundred twenty-one".