681992404797 has 16 divisors (see below), whose sum is σ = 995374594368. Its totient is φ = 411918046080.

The previous prime is 681992404787. The next prime is 681992404799. The reversal of 681992404797 is 797404299186.

It is a happy number.

It is not a de Polignac number, because 681992404797 - 2⁴ = 681992404781 is a prime.

It is a super-2 number, since 2×681992404797² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681992404799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35257288 + ... + 35276625.

It is an arithmetic number, because the mean of its divisors is an integer number (62210912148).

Almost surely, 2^681992404797 is an apocalyptic number.

It is an amenable number.

681992404797 is a deficient number, since it is larger than the sum of its proper divisors (313382189571).

681992404797 is a wasteful number, since it uses less digits than its factorization.

681992404797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70534220.

The product of its (nonzero) digits is 54867456, while the sum is 66.

The spelling of 681992404797 in words is "six hundred eighty-one billion, nine hundred ninety-two million, four hundred four thousand, seven hundred ninety-seven".