655433681 has 4 divisors (see below), whose sum is σ = 749067072. Its totient is φ = 561800292.

The previous prime is 655433663. The next prime is 655433689. The reversal of 655433681 is 186334556.

655433681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 655433681 - 2²⁶ = 588324817 is a prime.

It is a super-2 number, since 2×655433681² = 859186620378419522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655433689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46816685 + ... + 46816698.

It is an arithmetic number, because the mean of its divisors is an integer number (187266768).

Almost surely, 2^655433681 is an apocalyptic number.

It is an amenable number.

655433681 is a deficient number, since it is larger than the sum of its proper divisors (93633391).

655433681 is an equidigital number, since it uses as much as digits as its factorization.

655433681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93633390.

The product of its digits is 259200, while the sum is 41.

The square root of 655433681 is about 25601.4390415851. The cubic root of 655433681 is about 868.6461883373.

The spelling of 655433681 in words is "six hundred fifty-five million, four hundred thirty-three thousand, six hundred eighty-one".