681724049154 has 16 divisors (see below), whose sum is σ = 1363536744192. Its totient is φ = 227226575408.

The previous prime is 681724049119. The next prime is 681724049179. The reversal of 681724049154 is 451940427186.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 681724049097 and 681724049106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3593394 + ... + 3778349.

It is an arithmetic number, because the mean of its divisors is an integer number (85221046512).

Almost surely, 2^681724049154 is an apocalyptic number.

681724049154 is an abundant number, since it is smaller than the sum of its proper divisors (681812695038).

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

681724049154 is a wasteful number, since it uses less digits than its factorization.

681724049154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7387161.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 681724049154 in words is "six hundred eighty-one billion, seven hundred twenty-four million, forty-nine thousand, one hundred fifty-four".