506455681 has 8 divisors (see below), whose sum is σ = 525919680. Its totient is φ = 487125072.

The previous prime is 506455643. The next prime is 506455693. The reversal of 506455681 is 186554605.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-506455681 is a prime.

It is a super-2 number, since 2×506455681² = 512994713634347522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (506435681) 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, 25575 + ... + 40828.

It is an arithmetic number, because the mean of its divisors is an integer number (65739960).

Almost surely, 2^506455681 is an apocalyptic number.

It is an amenable number.

506455681 is a deficient number, since it is larger than the sum of its proper divisors (19463999).

506455681 is a wasteful number, since it uses less digits than its factorization.

506455681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66695.

The product of its (nonzero) digits is 144000, while the sum is 40.

The square root of 506455681 is about 22504.5702247344. The cubic root of 506455681 is about 797.1018474221.

The spelling of 506455681 in words is "five hundred six million, four hundred fifty-five thousand, six hundred eighty-one".