681475663 has 8 divisors (see below), whose sum is σ = 744121296. Its totient is φ = 618945600.

The previous prime is 681475649. The next prime is 681475667. The reversal of 681475663 is 366574186.

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 681475663 - 2⁵ = 681475631 is a prime.

It is a super-2 number, since 2×681475663² = 928818158522579138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681475667) 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, 16318 + ... + 40363.

It is an arithmetic number, because the mean of its divisors is an integer number (93015162).

Almost surely, 2^681475663 is an apocalyptic number.

681475663 is a deficient number, since it is larger than the sum of its proper divisors (62645633).

681475663 is a wasteful number, since it uses less digits than its factorization.

681475663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57785.

The product of its digits is 725760, while the sum is 46.

The square root of 681475663 is about 26105.0888334056. The cubic root of 681475663 is about 880.0015767017.

The spelling of 681475663 in words is "six hundred eighty-one million, four hundred seventy-five thousand, six hundred sixty-three".