280819985961 has 16 divisors (see below), whose sum is σ = 397328209920. Its totient is φ = 176038465680.

The previous prime is 280819985933. The next prime is 280819985969. The reversal of 280819985961 is 169589918082.

It is not a de Polignac number, because 280819985961 - 2²¹ = 280817888809 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 280819985892 and 280819985901.

It is not an unprimeable number, because it can be changed into a prime (280819985969) 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 15 ways as a sum of consecutive naturals, for example, 34486225 + ... + 34494366.

It is an arithmetic number, because the mean of its divisors is an integer number (24833013120).

Almost surely, 2^280819985961 is an apocalyptic number.

It is an amenable number.

280819985961 is a deficient number, since it is larger than the sum of its proper divisors (116508223959).

280819985961 is a wasteful number, since it uses less digits than its factorization.

280819985961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68980676.

The product of its (nonzero) digits is 22394880, while the sum is 66.

The spelling of 280819985961 in words is "two hundred eighty billion, eight hundred nineteen million, nine hundred eighty-five thousand, nine hundred sixty-one".