28546163665321 has 3 divisors (see below), whose sum is σ = 28546169008183. Its totient is φ = 28546158322460.

The previous prime is 28546163665273. The next prime is 28546163665399. The reversal of 28546163665321 is 12356636164582.

It is a happy number.

The square root of 28546163665321 is 5342861.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3354798855321 + 25191364810000 = 1831611^2 + 5019100^2 .

It is not a de Polignac number, because 28546163665321 - 2¹¹ = 28546163663273 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28546163665421) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2671431 + ... + 8014291.

Almost surely, 2^{28546163665321} is an apocalyptic number.

28546163665321 is the 5342861-st square number.

28546163665321 is the 2671431-st centered octagonal number.

It is an amenable number.

28546163665321 is a deficient number, since it is larger than the sum of its proper divisors (5342862).

28546163665321 is an frugal number, since it uses more digits than its factorization.

28546163665321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10685722 (or 5342861 counting only the distinct ones).

The product of its digits is 37324800, while the sum is 58.

The spelling of 28546163665321 in words is "twenty-eight trillion, five hundred forty-six billion, one hundred sixty-three million, six hundred sixty-five thousand, three hundred twenty-one".