280557605491 has 2 divisors, whose sum is σ = 280557605492. Its totient is φ = 280557605490.

The previous prime is 280557605483. The next prime is 280557605543. The reversal of 280557605491 is 194506755082.

It is a happy number.

It is an a-pointer prime, because the next prime (280557605543) can be obtained adding 280557605491 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 280557605491 - 2³ = 280557605483 is a prime.

It is not a weakly prime, because it can be changed into another prime (280557605791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140278802745 + 140278802746.

It is an arithmetic number, because the mean of its divisors is an integer number (140278802746).

Almost surely, 2^280557605491 is an apocalyptic number.

280557605491 is a deficient number, since it is larger than the sum of its proper divisors (1).

280557605491 is an equidigital number, since it uses as much as digits as its factorization.

280557605491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024000, while the sum is 52.

The spelling of 280557605491 in words is "two hundred eighty billion, five hundred fifty-seven million, six hundred five thousand, four hundred ninety-one".