681471999953 has 2 divisors, whose sum is σ = 681471999954. Its totient is φ = 681471999952.

The previous prime is 681471999941. The next prime is 681472000037. The reversal of 681471999953 is 359999174186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 418572768784 + 262899231169 = 646972^2 + 512737^2 .

It is a cyclic number.

It is not a de Polignac number, because 681471999953 - 2⁶ = 681471999889 is a prime.

It is not a weakly prime, because it can be changed into another prime (681471992953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340735999976 + 340735999977.

It is an arithmetic number, because the mean of its divisors is an integer number (340735999977).

Almost surely, 2^681471999953 is an apocalyptic number.

It is an amenable number.

681471999953 is a deficient number, since it is larger than the sum of its proper divisors (1).

681471999953 is an equidigital number, since it uses as much as digits as its factorization.

681471999953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 132269760, while the sum is 71.

The spelling of 681471999953 in words is "six hundred eighty-one billion, four hundred seventy-one million, nine hundred ninety-nine thousand, nine hundred fifty-three".