655723646 has 4 divisors (see below), whose sum is σ = 983585472. Its totient is φ = 327861822.

The previous prime is 655723639. The next prime is 655723661. The reversal of 655723646 is 646327556.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 655723597 and 655723606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163930910 + ... + 163930913.

It is an arithmetic number, because the mean of its divisors is an integer number (245896368).

Almost surely, 2^655723646 is an apocalyptic number.

655723646 is a deficient number, since it is larger than the sum of its proper divisors (327861826).

655723646 is a wasteful number, since it uses less digits than its factorization.

655723646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327861825.

The product of its digits is 907200, while the sum is 44.

The square root of 655723646 is about 25607.1014759578. The cubic root of 655723646 is about 868.7742663132.

It can be divided in two parts, 6557 and 23646, that added together give a palindrome (30203).

The spelling of 655723646 in words is "six hundred fifty-five million, seven hundred twenty-three thousand, six hundred forty-six".