681749050443 has 32 divisors (see below), whose sum is σ = 956774909952. Its totient is φ = 431200972800.

The previous prime is 681749050441. The next prime is 681749050453. The reversal of 681749050443 is 344050947186.

It is a happy number.

It is not a de Polignac number, because 681749050443 - 2¹ = 681749050441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681749050441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6309771 + ... + 6416907.

It is an arithmetic number, because the mean of its divisors is an integer number (29899215936).

Almost surely, 2^681749050443 is an apocalyptic number.

681749050443 is a deficient number, since it is larger than the sum of its proper divisors (275025859509).

681749050443 is a wasteful number, since it uses less digits than its factorization.

681749050443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108515.

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 681749050443 in words is "six hundred eighty-one billion, seven hundred forty-nine million, fifty thousand, four hundred forty-three".