655266681 has 6 divisors (see below), whose sum is σ = 946496330. Its totient is φ = 436844448.

The previous prime is 655266679. The next prime is 655266791. The reversal of 655266681 is 186662556.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 649791081 + 5475600 = 25491^2 + 2340^2 .

It is not a de Polignac number, because 655266681 - 2¹ = 655266679 is a prime.

It is a super-2 number, since 2×655266681² = 858748846457511522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655266611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36403696 + ... + 36403713.

Almost surely, 2^655266681 is an apocalyptic number.

It is an amenable number.

655266681 is a deficient number, since it is larger than the sum of its proper divisors (291229649).

655266681 is a wasteful number, since it uses less digits than its factorization.

655266681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72807415 (or 72807412 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 655266681 is about 25598.1772983937. The cubic root of 655266681 is about 868.5724070432.

The spelling of 655266681 in words is "six hundred fifty-five million, two hundred sixty-six thousand, six hundred eighty-one".