655244781 has 16 divisors (see below), whose sum is σ = 883104768. Its totient is φ = 432119600.

The previous prime is 655244771. The next prime is 655244801. The reversal of 655244781 is 187442556.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 655244781 - 2⁹ = 655244269 is a prime.

It is a super-2 number, since 2×655244781² = 858691446055475922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655244731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349276 + ... + 351146.

It is an arithmetic number, because the mean of its divisors is an integer number (55194048).

Almost surely, 2^655244781 is an apocalyptic number.

It is an amenable number.

655244781 is a deficient number, since it is larger than the sum of its proper divisors (227859987).

655244781 is a wasteful number, since it uses less digits than its factorization.

655244781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3072.

The product of its digits is 268800, while the sum is 42.

The square root of 655244781 is about 25597.7495299880. The cubic root of 655244781 is about 868.5627306024.

The spelling of 655244781 in words is "six hundred fifty-five million, two hundred forty-four thousand, seven hundred eighty-one".