981778806449 has 64 divisors (see below), whose sum is σ = 1280469565440. Its totient is φ = 732696053760.

The previous prime is 981778806431. The next prime is 981778806527. The reversal of 981778806449 is 944608877189.

It is a cyclic number.

It is not a de Polignac number, because 981778806449 - 2³² = 977483839153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981778806409) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 209824292 + ... + 209828970.

It is an arithmetic number, because the mean of its divisors is an integer number (20007336960).

Almost surely, 2^981778806449 is an apocalyptic number.

It is an amenable number.

981778806449 is a deficient number, since it is larger than the sum of its proper divisors (298690758991).

981778806449 is a wasteful number, since it uses less digits than its factorization.

With its successor (981778806450) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (7230).

981778806449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7230.

The product of its (nonzero) digits is 195084288, while the sum is 71.

The spelling of 981778806449 in words is "nine hundred eighty-one billion, seven hundred seventy-eight million, eight hundred six thousand, four hundred forty-nine".