681231612258 has 90 divisors (see below), whose sum is σ = 1611504204849. Its totient is φ = 215062741008.

The previous prime is 681231612247. The next prime is 681231612283. The reversal of 681231612258 is 852216132186.

681231612258 is a `hidden beast` number, since 6 + 8 + 1 + 2 + 3 + 1 + 612 + 25 + 8 = 666.

681231612258 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 498036484089 + 183195128169 = 705717^2 + 428013^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=583623.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 199597360 + ... + 199600772.

Almost surely, 2^681231612258 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681231612258

681231612258 is an abundant number, since it is smaller than the sum of its proper divisors (930272592591).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681231612258 is an frugal number, since it uses more digits than its factorization.

681231612258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6878 (or 3437 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The spelling of 681231612258 in words is "six hundred eighty-one billion, two hundred thirty-one million, six hundred twelve thousand, two hundred fifty-eight".