655661611 has 24 divisors (see below), whose sum is σ = 737720144. Its totient is φ = 582120000.

The previous prime is 655661581. The next prime is 655661623. The reversal of 655661611 is 116166556.

It is not a de Polignac number, because 655661611 - 2¹³ = 655653419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (655661311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1557181 + ... + 1557601.

Almost surely, 2^655661611 is an apocalyptic number.

655661611 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

655661611 is a deficient number, since it is larger than the sum of its proper divisors (82058533).

655661611 is a wasteful number, since it uses less digits than its factorization.

655661611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715 (or 704 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The square root of 655661611 is about 25605.8901622263. The cubic root of 655661611 is about 868.7468685359.

It can be divided in two parts, 655 and 661611, that added together give a palindrome (662266).

The spelling of 655661611 in words is "six hundred fifty-five million, six hundred sixty-one thousand, six hundred eleven".