654159681 has 24 divisors (see below), whose sum is σ = 1080555840. Its totient is φ = 373572576.

The previous prime is 654159673. The next prime is 654159703. The reversal of 654159681 is 186951456.

654159681 is a `hidden beast` number, since 6 + 54 + 1 + 596 + 8 + 1 = 666.

It is not a de Polignac number, because 654159681 - 2³ = 654159673 is a prime.

It is a super-2 number, since 2×654159681² = 855849776492043522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (654159631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 183391 + ... + 186923.

It is an arithmetic number, because the mean of its divisors is an integer number (45023160).

Almost surely, 2^654159681 is an apocalyptic number.

It is an amenable number.

654159681 is a deficient number, since it is larger than the sum of its proper divisors (426396159).

654159681 is a wasteful number, since it uses less digits than its factorization.

654159681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6485 (or 6482 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 654159681 is about 25576.5455251486. The cubic root of 654159681 is about 868.0830125998.

Subtracting from 654159681 its reverse (186951456), we obtain a square (467208225 = 21615²).

The spelling of 654159681 in words is "six hundred fifty-four million, one hundred fifty-nine thousand, six hundred eighty-one".