280879615561 has 2 divisors, whose sum is σ = 280879615562. Its totient is φ = 280879615560.

The previous prime is 280879615547. The next prime is 280879615579. The reversal of 280879615561 is 165516978082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144718615561 + 136161000000 = 380419^2 + 369000^2 .

It is a cyclic number.

It is not a de Polignac number, because 280879615561 - 2²¹ = 280877518409 is a prime.

It is a super-3 number, since 3×280879615561³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 280879615496 and 280879615505.

It is not a weakly prime, because it can be changed into another prime (280879615061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140439807780 + 140439807781.

It is an arithmetic number, because the mean of its divisors is an integer number (140439807781).

Almost surely, 2^280879615561 is an apocalyptic number.

It is an amenable number.

280879615561 is a deficient number, since it is larger than the sum of its proper divisors (1).

280879615561 is an equidigital number, since it uses as much as digits as its factorization.

280879615561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7257600, while the sum is 58.

The spelling of 280879615561 in words is "two hundred eighty billion, eight hundred seventy-nine million, six hundred fifteen thousand, five hundred sixty-one".