681940290735 has 64 divisors (see below), whose sum is σ = 1338878891520. Its totient is φ = 330637658400.

The previous prime is 681940290653. The next prime is 681940290751. The reversal of 681940290735 is 537092049186.

681940290735 is a `hidden beast` number, since 6 + 81 + 9 + 402 + 90 + 73 + 5 = 666.

It is not a de Polignac number, because 681940290735 - 2¹⁵ = 681940257967 is a prime.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 2714401 + ... + 2954970.

It is an arithmetic number, because the mean of its divisors is an integer number (20919982680).

It is a 1-persistent number, because it is pandigital, but 2⋅681940290735 = 1363880581470 is not.

Almost surely, 2^681940290735 is an apocalyptic number.

681940290735 is a deficient number, since it is larger than the sum of its proper divisors (656938600785).

681940290735 is an equidigital number, since it uses as much as digits as its factorization.

681940290735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5669408 (or 5669390 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 681940290735 in words is "six hundred eighty-one billion, nine hundred forty million, two hundred ninety thousand, seven hundred thirty-five".