280623653561 has 8 divisors (see below), whose sum is σ = 290407653120. Its totient is φ = 270846808848.

The previous prime is 280623653483. The next prime is 280623653593. The reversal of 280623653561 is 165356326082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 280623653561 - 2¹⁸ = 280623391417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280623656561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1708841 + ... + 1865846.

It is an arithmetic number, because the mean of its divisors is an integer number (36300956640).

Almost surely, 2^280623653561 is an apocalyptic number.

It is an amenable number.

280623653561 is a deficient number, since it is larger than the sum of its proper divisors (9783999559).

280623653561 is a wasteful number, since it uses less digits than its factorization.

280623653561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3577423.

The product of its (nonzero) digits is 1555200, while the sum is 47.

The spelling of 280623653561 in words is "two hundred eighty billion, six hundred twenty-three million, six hundred fifty-three thousand, five hundred sixty-one".