280665412421 has 4 divisors (see below), whose sum is σ = 284510144172. Its totient is φ = 276820680672.

The previous prime is 280665412399. The next prime is 280665412427. The reversal of 280665412421 is 124214566082.

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 118287844900 + 162377567521 = 343930^2 + 402961^2 .

It is a cyclic number.

It is not a de Polignac number, because 280665412421 - 2³⁰ = 279591670597 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 (280665412427) 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, 1922365766 + ... + 1922365911.

It is an arithmetic number, because the mean of its divisors is an integer number (71127536043).

Almost surely, 2^280665412421 is an apocalyptic number.

It is an amenable number.

280665412421 is a deficient number, since it is larger than the sum of its proper divisors (3844731751).

280665412421 is an equidigital number, since it uses as much as digits as its factorization.

280665412421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3844731750.

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 280665412421 in words is "two hundred eighty billion, six hundred sixty-five million, four hundred twelve thousand, four hundred twenty-one".