449681919561 has 24 divisors (see below), whose sum is σ = 774607367040. Its totient is φ = 245788874496.

The previous prime is 449681919517. The next prime is 449681919593. The reversal of 449681919561 is 165919186944.

449681919561 is a `hidden beast` number, since 4 + 4 + 9 + 68 + 1 + 9 + 1 + 9 + 561 = 666.

It is not a de Polignac number, because 449681919561 - 2¹⁷ = 449681788489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (449681919161) 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 23 ways as a sum of consecutive naturals, for example, 155168296 + ... + 155171193.

It is an arithmetic number, because the mean of its divisors is an integer number (32275306960).

Almost surely, 2^449681919561 is an apocalyptic number.

It is an amenable number.

449681919561 is a deficient number, since it is larger than the sum of its proper divisors (324925447479).

449681919561 is a wasteful number, since it uses less digits than its factorization.

449681919561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310339525 (or 310339522 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 63.

The spelling of 449681919561 in words is "four hundred forty-nine billion, six hundred eighty-one million, nine hundred nineteen thousand, five hundred sixty-one".