681209486910 has 48 divisors (see below), whose sum is σ = 1864362810960. Its totient is φ = 172095027840.

The previous prime is 681209486897. The next prime is 681209486939. The reversal of 681209486910 is 19684902186.

681209486910 is a `hidden beast` number, since 68 + 12 + 0 + 9 + 486 + 91 + 0 = 666.

It is a super-2 number, since 2×681209486910² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 199182351 + ... + 199185770.

It is an arithmetic number, because the mean of its divisors is an integer number (38840891895).

Almost surely, 2^681209486910 is an apocalyptic number.

681209486910 is an abundant number, since it is smaller than the sum of its proper divisors (1183153324050).

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

681209486910 is a wasteful number, since it uses less digits than its factorization.

681209486910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398368153 (or 398368150 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 681209486910 in words is "six hundred eighty-one billion, two hundred nine million, four hundred eighty-six thousand, nine hundred ten".