280817888779 has 2 divisors, whose sum is σ = 280817888780. Its totient is φ = 280817888778.

The previous prime is 280817888713. The next prime is 280817888807. The reversal of 280817888779 is 977888718082.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280817888779 is a prime.

It is a super-2 number, since 2×280817888779² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (280817888479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140408944389 + 140408944390.

It is an arithmetic number, because the mean of its divisors is an integer number (140408944390).

Almost surely, 2^280817888779 is an apocalyptic number.

280817888779 is a deficient number, since it is larger than the sum of its proper divisors (1).

280817888779 is an equidigital number, since it uses as much as digits as its factorization.

280817888779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 202309632, while the sum is 73.

The spelling of 280817888779 in words is "two hundred eighty billion, eight hundred seventeen million, eight hundred eighty-eight thousand, seven hundred seventy-nine".