681816477 has 8 divisors (see below), whose sum is σ = 940436640. Its totient is φ = 438870320.

The previous prime is 681816469. The next prime is 681816481. The reversal of 681816477 is 774618186.

681816477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681816477 - 2³ = 681816469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681816407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3918399 + ... + 3918572.

It is an arithmetic number, because the mean of its divisors is an integer number (117554580).

Almost surely, 2^681816477 is an apocalyptic number.

It is an amenable number.

681816477 is a deficient number, since it is larger than the sum of its proper divisors (258620163).

681816477 is a wasteful number, since it uses less digits than its factorization.

681816477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7837003.

The product of its digits is 451584, while the sum is 48.

The square root of 681816477 is about 26111.6157485514. The cubic root of 681816477 is about 880.1482519685.

The spelling of 681816477 in words is "six hundred eighty-one million, eight hundred sixteen thousand, four hundred seventy-seven".