681448563 has 12 divisors (see below), whose sum is σ = 1007206200. Its totient is φ = 443733696.

The previous prime is 681448561. The next prime is 681448591. The reversal of 681448563 is 365844186.

681448563 is a `hidden beast` number, since 6 + 81 + 4 + 4 + 8 + 563 = 666.

It is not a de Polignac number, because 681448563 - 2¹ = 681448561 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (681448561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 880038 + ... + 880811.

It is an arithmetic number, because the mean of its divisors is an integer number (83933850).

Almost surely, 2^681448563 is an apocalyptic number.

681448563 is a deficient number, since it is larger than the sum of its proper divisors (325757637).

681448563 is a wasteful number, since it uses less digits than its factorization.

681448563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760898 (or 1760895 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 681448563 is about 26104.5697723598. The cubic root of 681448563 is about 879.9899116440.

The spelling of 681448563 in words is "six hundred eighty-one million, four hundred forty-eight thousand, five hundred sixty-three".