655271664643 has 32 divisors (see below), whose sum is σ = 685451289600. Its totient is φ = 625951200000.

The previous prime is 655271664637. The next prime is 655271664701. The reversal of 655271664643 is 346466172556.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655271664643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655271604643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137920518 + ... + 137925268.

It is an arithmetic number, because the mean of its divisors is an integer number (21420352800).

Almost surely, 2^655271664643 is an apocalyptic number.

655271664643 is a deficient number, since it is larger than the sum of its proper divisors (30179624957).

655271664643 is a wasteful number, since it uses less digits than its factorization.

655271664643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5259.

The product of its digits is 21772800, while the sum is 55.

The spelling of 655271664643 in words is "six hundred fifty-five billion, two hundred seventy-one million, six hundred sixty-four thousand, six hundred forty-three".