655117845778 has 16 divisors (see below), whose sum is σ = 1072403652960. Its totient is φ = 297671774400.

The previous prime is 655117845769. The next prime is 655117845779. The reversal of 655117845778 is 877548711556.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (655117845779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5391783 + ... + 5511946.

It is an arithmetic number, because the mean of its divisors is an integer number (67025228310).

Almost surely, 2^655117845778 is an apocalyptic number.

655117845778 is a deficient number, since it is larger than the sum of its proper divisors (417285807182).

655117845778 is a wasteful number, since it uses less digits than its factorization.

655117845778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10906473.

The product of its digits is 65856000, while the sum is 64.

It can be divided in two parts, 6551178 and 45778, that added together give a palindrome (6596956).

The spelling of 655117845778 in words is "six hundred fifty-five billion, one hundred seventeen million, eight hundred forty-five thousand, seven hundred seventy-eight".