681364550361 has 16 divisors (see below), whose sum is σ = 991307962368. Its totient is φ = 412851440400.

The previous prime is 681364550323. The next prime is 681364550381. The reversal of 681364550361 is 163055463186.

It is not a de Polignac number, because 681364550361 - 2¹⁸ = 681364288217 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 681364550361.

It is not an unprimeable number, because it can be changed into a prime (681364550381) 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, 2276221 + ... + 2558106.

It is an arithmetic number, because the mean of its divisors is an integer number (61956747648).

Almost surely, 2^681364550361 is an apocalyptic number.

It is an amenable number.

681364550361 is a deficient number, since it is larger than the sum of its proper divisors (309943412007).

681364550361 is a wasteful number, since it uses less digits than its factorization.

681364550361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4838612.

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 681364550361 in words is "six hundred eighty-one billion, three hundred sixty-four million, five hundred fifty thousand, three hundred sixty-one".